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Biblical Meaning of "Two Become One" in Marriage

The phrase "two become one flesh" originates in Genesis 2:24, where it describes the foundational union of marriage: "Therefore a man shall leave his father and his mother and hold fast to his wife, and they shall become one flesh" [2]. This concept is central to the biblical understanding of marriage and is reaffirmed in the New Testament by Jesus and the Apostle Paul [1, 9, 10, 16].

In the Hebrew text of Genesis 2:24, the phrase "one flesh" (בָּשָׂר אֶחָד, basar echad) signifies a profound unity. The Hebrew word for "two" (שְׁתֵּי, shetayim) appears frequently in the Old Testament, often in contexts of pairs or duality, such as "two wives" (Deuteronomy 21:15) or numerical counts [3, 4, 5, 7]. However, in Genesis 2:24, the joining of these two into "one flesh" transcends a mere numerical pairing.

Jesus directly quotes Genesis 2:24 in Mark 10:8, stating, "and the two shall be one flesh; so that they no longer are two, but one flesh" [1]. This reiteration emphasizes that the marital bond creates a new, indivisible entity [10, 11]. The Easton's Bible Dictionary notes that this original charter of marriage, established in Paradise, was confirmed by Christ as the basis for all regulations concerning marriage [6]. This original law implies monogamy, a principle later violated by practices like polygamy, which became prevalent in the patriarchal age [6, 8].

The Apostle Paul also refers to this concept in 1 Corinthians 6:16, applying the "one flesh" principle to sexual union, even in illicit contexts, to highlight the profound physical and spiritual connection involved [9]. He further elaborates on the unity of husband and wife in Ephesians 5:28-31, urging husbands to cherish their wives because "the two have become one" [13].

The "one flesh" union is understood not merely as a figurative expression but as a "real, physical, vital, and spiritual union" [15]. Charles Hodge describes it as a mysterious union where man and wife become one flesh, a doctrine underlying the Levitical law concerning kinship [15]. This deep connection is why jealousy in marriage is considered one of the fiercest human passions, as it involves the violation of sacred rights [12]. The patristic writer Tertullian also emphasized the unity of marriage, seeing it as a type for Christ and the Church, and noting that God fashioned only one woman for man, establishing monogamy from the beginning [14].

Sources

  1. Mark “Mark 10:8 (LITV) — and the two shall be one flesh;" so that they no longer are two, but one flesh. Gen. 2:24”
  2. Genesis “Quam ob rem relinquet homo patrem suum, et matrem, et adhærebit uxori suæ : et erunt duo in carne una. -- Genesis 2:24”
  3. MACULA Hebrew “Deuteronomy 21:15 — Hebrew linguistic analysis (MACULA): Text: כִּֽי תִהְיֶ֨יןָ לְ אִ֜ישׁ שְׁתֵּ֣י נָשִׁ֗ים הָ אַחַ֤ת אֲהוּבָה֙ וְ הָ אַחַ֣ת שְׂנוּאָ֔ה וְ יָֽלְדוּ ל֣ וֹ בָנִ֔ים הָ אֲהוּבָ֖ה וְ הַ שְּׂנוּאָ֑ה וְ הָיָ֛ה הַ בֵּ֥ן הַ בְּכ֖וֹר לַ שְּׂנִיאָֽה Word-by-word: כִּֽי (kiy-) = "if" [3588] C; תִהְיֶ֨יןָ (ṯihyeynā) = "they are" [1961] Vqi3fp; לְ (lə) = "to" [3807a] R; אִ֜ישׁ (ʾiyš) = "man" [0376] Ncmsa; שְׁתֵּ֣י (šətēy) = "two" [8147] Acfdc; נָשִׁ֗ים (nāšiym) = "wives" [0802] Ncfpa; הָ (hā) = "the" [1886a] Td; אַחַ֤ת (ʾaḥaṯ) = "one" [0259] Acfsa; אֲהוּבָה֙ (ʾăhûḇāh) = "loved" [0157] Vqsfsa”
  4. MACULA Hebrew “2 Kings 21:1 — Hebrew linguistic analysis (MACULA): Text: בֶּן שְׁתֵּ֨ים עֶשְׂרֵ֤ה שָׁנָה֙ מְנַשֶּׁ֣ה בְ מָלְכ֔ וֹ וַ חֲמִשִּׁ֤ים וְ חָמֵשׁ֙ שָׁנָ֔ה מָלַ֖ךְ בִּ ירוּשָׁלִָ֑ם וְ שֵׁ֥ם אִמּ֖ וֹ חֶפְצִי בָֽהּ Word-by-word: בֶּן (ben-) = "son of" [1121] Ncmsc; שְׁתֵּ֨ים (šətēym) = "two" [8147] Acfda; עֶשְׂרֵ֤ה (ʿeśrēh) = "ten" [6240] Acfsa; שָׁנָה֙ (šānāh) = "year" [8141] Ncfsa; מְנַשֶּׁ֣ה (mənaššeh) = "Manasseh" [4519] Np; בְ (ḇə) = "when" [0871a] R; מָלְכ֔ = "became king" [4427] Vqc; וֹ = "he" [2050c] Sp3ms; וַ (wa) = "and" [2050b] C; חֲמִשִּׁ֤ים (ḥămiššiym) = "fifty" [2572] Acbpa; וְ (wə) = "an”
  5. MACULA Hebrew “2 Kings 22:1 — Hebrew linguistic analysis (MACULA): Text: בֶּן שְׁמֹנֶ֤ה שָׁנָה֙ יֹאשִׁיָּ֣הוּ בְ מָלְכ֔ וֹ וּ שְׁלֹשִׁ֤ים וְ אַחַת֙ שָׁנָ֔ה מָלַ֖ךְ בִּ ירוּשָׁלִָ֑ם וְ שֵׁ֣ם אִמּ֔ וֹ יְדִידָ֥ה בַת עֲדָ֖יָה מִ בָּצְקַֽת Word-by-word: בֶּן (ben-) = "son of" [1121] Ncmsc; שְׁמֹנֶ֤ה (šəmōneh) = "eight" [8083] Acfsa; שָׁנָה֙ (šānāh) = "year" [8141] Ncfsa; יֹאשִׁיָּ֣הוּ (yōʾšiyyāhû) = "Josiah" [2977a] Np; בְ (ḇə) = "when" [0871a] R; מָלְכ֔ = "became king" [4427] Vqc; וֹ = "he" [2050c] Sp3ms; וּ (û) = "and" [2050b] C; שְׁלֹשִׁ֤ים (šəlōšiym) = "thirty" [7970] Acbpa; וְ (wə) = "and" [2050b] C; אַחַת֙ ”
  6. Easton's Bible Dictionary “Easton's Bible Dictionary: Marriage — Was instituted in Paradise when man was in innocence (Gen. 2:18-24). Here we have its original charter, which was confirmed by our Lord, as the basis on which all regulations are to be framed (Matt. 19:4, 5). It is evident that monogamy was the original law of marriage (Matt. 19:5; 1 Cor. 6:16). This law was violated in after times, when corrupt usages began to be introduced (Gen. 4:19; 6:2). We meet with the prevalence of polygamy and concubinage in the patriarchal age (Gen. 16:1-4; 22:21-24; 28:8, 9; 29:23-30, etc.). Polygamy was acknowledged in the Mosa”
  7. MACULA Hebrew “2 Kings 8:26 — Hebrew linguistic analysis (MACULA): Text: בֶּן עֶשְׂרִ֨ים וּ שְׁתַּ֤יִם שָׁנָה֙ אֲחַזְיָ֣הוּ בְ מָלְכ֔ וֹ וְ שָׁנָ֣ה אַחַ֔ת מָלַ֖ךְ בִּ ירוּשָׁלִָ֑ם וְ שֵׁ֤ם אִמּ וֹ֙ עֲתַלְיָ֔הוּ בַּת עָמְרִ֖י מֶ֥לֶךְ יִשְׂרָאֵֽל Word-by-word: בֶּן (ben-) = "son of" [1121] Ncmsc; עֶשְׂרִ֨ים (ʿeśriym) = "twenty" [6242] Acbpa; וּ (û) = "and" [2050b] C; שְׁתַּ֤יִם (šətayim) = "two" [8147] Acfda; שָׁנָה֙ (šānāh) = "year" [8141] Ncfsa; אֲחַזְיָ֣הוּ (ʾăḥazyāhû) = "Ahaziah" [0274a] Np; בְ (ḇə) = "when" [0871a] R; מָלְכ֔ = "became king" [4427] Vqc; וֹ = "he" [2050c] Sp3ms; וְ (wə) = "and" [2050b] C; ש”
  8. Easton's Bible Dictionary “Easton's Bible Dictionary: Wife — The ordinance of marriage was sanctioned in Paradise (Gen. 2:24; Matt. 19:4-6). Monogamy was the original law under which man lived, but polygamy early commenced (Gen. 4:19), and continued to prevail all down through Jewish history. The law of Moses regulated but did not prohibit polygamy. A man might have a plurality of wives, but a wife could have only one husband. A wife's legal rights (Ex. 21:10) and her duties (Prov. 31:10-31; 1 Tim. 5:14) are specified. She could be divorced in special cases (Deut. 22:13-21), but could not divorce her husband. Divorce wa”
  9. 1 Corinthians (Baptist/Reformed) “John Gill on 1 Corinthians 6:16: What? know ye not that he which is joined to an harlot,.... Not in marriage, but in carnal copulation, and unclean embraces, is one body with her for two ("saith he", Adam, or Moses, or God, or the Scripture, or as R. Sol. Jarchi says, the Holy Spirit, Gen 2:24) shall be one flesh; what is originally said of copulation in lawful marriage, in which man and wife, legally coupled together, become one flesh, is applied to the unlawful copulation of a man with an harlot, by which act they also become one body, one flesh; and which is made use of by the apostle, ”
  10. Mark (Baptist/Reformed) “John Gill on Mark 10:8: And the twain shall be one flesh,.... This is the remaining part of the citation out of Gen 2:24; See Gill on Mat 19:5; so then they are no more twain; but one flesh; as Adam and Eve were both by creation and marriage: and so two persons, a man and woman, being lawfully married together, become one flesh, or "one body", as the Arabic and Persic versions render the phrase; and therefore the wife is to be loved by the husband as his own body, and from whom there should be no separation, until death, but in case of adultery; See Gill on Mat 19:6.”
  11. Mark (Protestant academic) “Tyndale House on Mark 10:5: 10:5-9 God permitted divorce as a concession to the hard hearts of the people. But God’s will is more aptly expressed in the passages that Jesus quotes from the law of Moses (Gen 1:27; 2:23-24; see also Mal 2:16). Jesus shows that God delights in marriage, which is the creation of a new union in which two become one. No one should rebel against God’s will by seeking to split apart what God has united.”
  12. CCEL (Reformed (Old Princeton)) “Charles Hodge, Systematic Theology, Vol. 3, section 49: why jealousy in man or woman is the fiercest of all 384 human passions. It involves a sense of injury; of the violation of the most sacred rights; more sacred even than the rights of property or life. Conjugal love, therefore, cannot by possibility exist except between one man and one woman. Monogamy has its foundation in the very constitution of our nature. Polygamy is unnatural, and necessarily destructive of the normal, or divinely constituted relation between husband and wife. Secondly, in another aspect, the union involved in marriag”
  13. Ephesians (Protestant academic) “Tyndale House on Ephesians 5:28: 5:28-29 Husbands should prize and cherish their wives, for in marriage the two have become one (see 5:31).”
  14. Schaff ANF/NPNF (Patristic) “ANF Vol 4: Tertullian IV, Minucius Felix, Commodian, Origen — CHAP. V.--UNITY OF MARRIAGE TAUGHT BY ITS FIRST INSTITUTION, AND BY THE APOSTLE'S APPLICATION OF THAT PRIMAL TYPE TO CHRIST AND THE CHURCH.: For the laying down[1] of the law of once marrying, the very origin of the human race is our authority; witnessing as it emphatically does what God constituted in the beginning for a type to be examined with care by posterity. For when He had moulded man, and had foreseen that a peer was necessary for him, He borrowed from his ribs one, and fashioned for him one woman;[2] whereas, of course, ne”
  15. CCEL (Reformed (Old Princeton)) “Charles Hodge, Systematic Theology, Vol. 3, section 49: civil contract. It is a real, physical, vital, and spiritual union, in virtue of which man and wife become, not merely in a figurative sense, but really, although in a mysterious sense, one flesh. This is not only expressly 419 declared by Christ himself to be the nature of marriage, but it is the doctrine which underlies the whole Levitical law on this subject. Nearness of kin is expressed constantly by saying that one is “flesh of the flesh” of the other, שְׁאֵר בְשָׂרוֹ , “ Carnem carnis suæ s. corporis sui esse cognatam propinquam, qu”
  16. Matthew (Presbyterian) “Jamieson, Fausset & Brown on Matthew 19:5: And said, For this cause--to follow out this divine appointment. shall a man leave father and mother, and shall cleave to his wife: and they twain shall be one flesh?--Jesus here sends them back to the original constitution of man as one pair, a male and a female; to their marriage, as such, by divine appointment; and to the purpose of God, expressed by the sacred historian, that in all time one man and one woman should by marriage become one flesh--so to continue as long as both are in the flesh. This being God's constitution, let not man break it ”
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