The Sin of Eating the Fruit of Knowledge of Good Evil

The divine command in Genesis 2:17 forbade Adam from eating the fruit of the tree of knowledge of good and evil, warning that "in the day that thou eatest thereof, thou shalt die the death" ^[2]. This prohibition stood as the single negative command in Eden, where God had otherwise granted permission to eat freely from every other tree in the garden ^{[1, 12]}. The transgression of this specific command introduced sin and death into human experience, making it the paradigmatic act of disobedience against divine law.

The Nature of the Prohibition

The tree itself stood "in the midst of the garden of Eden, beside the tree of life" ^[1], occupying a central position in the created order. Charles Hodge argues that "the tree of knowledge of good and evil, is simply the tree of knowledge," suggesting the phrase "good and evil" functions as a merism expressing totality rather than moral discernment ^[5]. This interpretation finds support in biblical usage where maturity is expressed as the ability "to discern both good and evil" (Hebrews 5:14), while immaturity is described as not yet knowing "to refuse the evil and choose the good" ^[5]. The tree may have been appointed to communicate knowledge itself, analogous to how the tree of life sustained or imparted life ^[7].

The command's simplicity made the test of obedience unmistakable. Abraham Ibn Ezra notes the emphatic structure of the Hebrew text, where "of it" appears redundantly after the prohibition, underscoring the specificity of what was forbidden ^[12]. God had positively commanded the eating of other trees, making this single restriction a clear boundary for human obedience.

The Character of the Sin

When Adam and Eve violated this command, they committed what Christian theology defines as sin: "any want of conformity unto or transgression of the law of God" ^[3]. The act was not merely a violation of natural law or cosmic order but "an offence against a personal lawgiver and moral governor" ^[3]. John Gill identifies this transgression as the means by which "sin entered into the world," noting that "the sin of Adam and the guilt of that were in the world before" the Mosaic law, demonstrating that positive divine commands establish moral obligation independent of later legal codes ^[4].

Rabbinic tradition in the Talmud highlights how Eve compounded the original prohibition by adding to it. When she told the serpent, "You shall not eat of it, neither shall you touch it," she expanded God's command beyond what He had actually said ^[6]. Ḥizkiyya derives from this the principle that "anyone who adds, subtracts," for the serpent exploited her addition by showing her that touching the tree caused no harm, thereby undermining her confidence in the prohibition against eating ^[6].

Consequences and Theological Significance

The immediate consequence was death, as God had warned. Augustine emphasizes that this punishment was "just and deserved," noting that the first human beings "willed not to obey the commandment which they had received from God" despite having been given permission to eat from every tree, including the tree of life ^[10]. The irony in God's declaration, "Behold, the man has become as one of us, to know good and evil" ^[9], was not mockery but a sobering confrontation with the outcome of their choice. Keil and Delitzsch clarify that this statement contains "no irony, as though man had exalted himself to a position of autonomy resembling that of God," but rather acknowledges that humanity truly had gained knowledge of good and evil—though at the cost of innocence and immortality ^[11].

Matthew Henry observes that God's words served "to awaken and humble them, and to bring them to a sense of their sin and folly" ^[9]. The knowledge gained was experiential rather than merely intellectual: they now knew evil by having committed it, and knew good by having lost it. Irenaeus records that God had commanded Adam, "From every tree which is in the garden thou shalt eat for food; but from the tree of the knowledge of good and evil, from it thou shalt not eat" ^[8], establishing that the devil's lie against this clear command introduced deception as the instrument of human fall.

Sources

Easton's Bible Dictionary “Easton's Bible Dictionary: Tree of the knowledge of good and evil — Stood in the midst of the garden of Eden, beside the tree of life (Gen. 2, 3). Adam and Eve were forbidden to take of the fruit which grew upon it. But they disobeyed the divine injunction, and so sin and death by sin entered our world and became the heritage of Adam's posterity. (See [641]ADAM.)”
Genesis “Genesis 2:17 (Geneva1599) — But of the tree of knowledge of good and euill, thou shalt not eate of it: for in the day that thou eatest thereof, thou shalt die the death.”
Easton's Bible Dictionary “Easton's Bible Dictionary: Sin — Is "any want of conformity unto or transgression of the law of God" (1 John 3:4; Rom. 4:15), in the inward state and habit of the soul, as well as in the outward conduct of the life, whether by omission or commission (Rom. 6:12-17; 7:5-24). It is "not a mere violation of the law of our constitution, nor of the system of things, but an offence against a personal lawgiver and moral governor who vindicates his law with penalties. The soul that sins is always conscious that his sin is (1) intrinsically vile and polluting, and (2) that it justly deserves punishment,”
Romans (Baptist/Reformed) “John Gill on Romans 5:13: For until the law, sin was in the world,.... This is a proof of sin's having entered into the world, by one man's transgression of the positive law of God, which forbid him the eating of the fruit of the tree of knowledge of good and evil; since it was in the world before the law of Moses was given: the sin of Adam and the guilt of that were in the world before, and came upon all men to condemnation; the general corruption of nature appeared before; and actual sins, and transgressions of all sorts were committed before; as by the immediate posterity of Adam, by the me”
CCEL (Reformed (Old Princeton)) “Charles Hodge, Systematic Theology, Vol. 2, section 36: shall know to refuse the evil and choose the good.” On the other hand maturity, whether in intellectual or spiritual knowledge, is expressed by saying that one has power to distinguish between good and evil. Thus the perfect or mature believer has his “senses exercised to discern both good and evil,” Heb. v. 14 . Agreeably to the analogy of these passages, the tree of knowledge of good and evil, is simply the tree of knowledge. The one expression is fully equivalent to the other. This interpretation relieves the passage of many difficulti”
Babylonian Talmud (Jewish (Rabbinic)) “Babylonian Talmud, Sanhedrin 29a.34: Ḥizkiyya says: From where is it derived that anyone who adds, subtracts? It is derived from a verse, as it is stated that Eve said: “God has said: You shall not eat of it, neither shall you touch it” (Genesis 3:3), whereas God had actually rendered prohibited only eating from the tree but not touching it, as it is stated: “But of the Tree of Knowledge of good and evil, you shall not eat of it” (Genesis 2:17). Because Eve added that there was a prohibition against touching the tree, the snake showed her that touching it does not cause her to die, and she con”
CCEL (Reformed (Old Princeton)) “Charles Hodge, Systematic Theology, Vol. 2, section 36: immortal life to obedient Adam in that terrestrial paradise is the type of Him who is the source of spiritual and eternal life to his people in the paradise above. The Tree of Knowledge . The nature and significancy of the tree of knowledge of good and evil are not so clear. By the tree of knowledge, indeed, it is altogether probable, we are to understand a tree the fruit of which would impart knowledge. This may be inferred, (1.) From analogy As the tree of life sustained or imparted life, so the tree of knowledge was appointed to commun”
Schaff ANF/NPNF (Patristic) “ANF Vol 1: Clement, Polycarp, Ignatius, Barnabas, Papias, Justin Martyr, Irenaeus — CHAP. XXIII.--THE DEVIL IS WELL PRACTISED IN FALSEHOOD, BY WHICH ADAM HAVING BEEN LED ASTRAY, SINNED ON THE SIXTH DAY OF THE CREATION, IN WHICH DAY ALSO HE HAS BEEN RENEWED BY CHRIST. (part 1): 1. He had indeed been already accustomed to lie against God, for the purpose of leading men astray. For at the beginning, when God had given to man a variety of things for food, while He commanded him not to eat of one tree only, as the Scripture tells us that God said to Adam: "From every tree which is in the garden tho”
Genesis (Nonconformist/Puritan) “Matthew Henry on Genesis 3:22: Sentence being passed upon the offenders, we have here execution, in part, done upon them immediately. Observe here, I. How they were justly disgraced and shamed before God and the holy angels, by the ironical upbraiding of them with the issue of their enterprise: "Behold, the man has become as one of us, to know good and evil! A goodly god he makes! Does he not? See what he has got, what preferments, what advantages, by eating forbidden fruit!" This was said to awaken and humble them, and to bring them to a sense of their sin and folly, and to repentance for it,”
Schaff ANF/NPNF (Patristic) “NPNF1 Vol 5: Augustine — Anti-Pelagian — CHAP. 35 [XXI.] -- ADAM AND EVE; OBEDIENCE MOST STRONGLY ENJOINED BY GOD ON MAN. (part 1): When the first human beings--the one man Adam, and his wife Eve who came out of him --willed not to obey the commandment which they had received from God, a just and deserved punishment overtook them. The Lord had threatened that, on the day they ate the forbidden fruit, they should surely die.[2] Now, inasmuch as they had received the permission of using for food every tree that grew in Paradise, among which God had planted the tree of life, but had been forbidd”
Genesis (Lutheran) “Keil & Delitzsch on Genesis 3:22: Clothed in this sign of mercy, the man was driven out of paradise, to bear the punishment of his sin. The words of Jehovah, "The man is become as one of Us, to know good and evil," contain no irony, as though man had exalted himself to a position of autonomy resembling that of God; for "irony at the expense of a wretched tempted soul might well befit Satan, but not the Lord." Likeness to God is predicated only with regard to the knowledge of good and evil, in which the man really had become like God. In order that, after the germ of death had penetrated into h”
Sefaria (Jewish (Rationalist)) “Abraham Ibn Ezra on Genesis 2:17: [THOU SHALT NOT EAT OF IT.] Even though I (God) permitted you to eat of the fruit of the trees of the garden, do not eat of the fruit of the tree of knowledge. 61 The Hebrew term implies a commandment to eat of the other trees in the garden, hence I.E.’s comment (Krinsky). One might ask, What need is there for the term of it after having stated but of the tree of the knowledge…thou shalt not eat ? 62 The verse reads, but of the tree of the knowledge of good and evil, thou shalt not eat of it . It would have sufficed to state, but of the tree of the knowledge o”

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