Jewish Law on Biological Versus Adopted Children
In ancient Israel, the legal status of children was primarily determined by birth, though adoption and other forms of familial integration were recognized. The concept of "adoption" in the biblical sense often involved taking someone into one's household and granting them the name, place, and privileges of a son or daughter, even if not biologically related [1]. Examples include Pharaoh's daughter adopting Moses (Exodus 2:10) and Mordecai adopting Esther (Esther 2:7) [1].
While the Mosaic Law did not explicitly detail adoption procedures in the way modern legal systems do, it did establish principles that integrated individuals into the community regardless of their birth circumstances. For instance, the law often stipulated the same legal standing for "the homeborn" Israelite and "the alien that lives among them" in various contexts, such as observing the law (Exodus 12:49; Numbers 15:29) [2, 3]. This suggests a framework where individuals, once integrated, shared common legal obligations and protections.
The distinction between biological and non-biological children was less about legitimacy in the modern sense and more about lineage and inheritance. Children born to a man by a concubine, for example, were not considered illegitimate but formed a "supplementary family" whose names could appear in patriarchal genealogies (Genesis 22:24; 1 Chronicles 1:22) [5]. Their position and provision depended on the father's will [5].
A significant aspect of Israelite law concerning birthright was the status of the firstborn. The firstborn male, regardless of whether his mother was favored or "hated," was to be acknowledged and receive a double portion of the father's inheritance (Deuteronomy 21:17) [9]. This dedication of the firstborn, both of humans and animals, to God (Exodus 13:2, 12) was a commemoration of the sparing of Israel's firstborn in Egypt [4, 6].
Theological traditions later distinguished between natural and adopted children. Thomas Aquinas, for example, categorized children as "natural and legitimate" (born of true marriage), "natural and illegitimate" (born of fornication), "legitimate and not natural" (adopted children), and "neither legitimate nor natural" (born of adultery or incest) [10]. John Gill, commenting on Roman law, noted that adopted children were equal to natural children in possessing inheritance, though Jewish law typically favored male heirs [7]. Augustine also recognized the practice of women adopting children born to their husbands by handmaids, as seen with Sarah, Rachel, and Leah [8].
Sources
- Easton's Bible Dictionary “Easton's Bible Dictionary: Adoption — The giving to any one the name and place and privileges of a son who is not a son by birth. (1.) Natural. Thus Pharaoh's daughter adopted Moses (Ex. 2:10), and Mordecai Esther (Esther 2:7). (2.) National. God adopted Israel (Ex. 4:22; Deut. 7:6; Hos. 11:1; Rom. 9:4). (3.) Spiritual. An act of God's grace by which he brings men into the number of his redeemed family, and makes them partakers of all the blessings he has provided for them. Adoption represents the new relations into which the believer is introduced by justification, and the privileges connecte”
- Exodus “Exodus 12:49 (BBE) — The law is the same for him who is an Israelite by birth and for the man from a strange country who is living with you.”
- Numbers “Numbers 15:29 (LITV) — both the homeborn among the sons of Israel, and the alien that lives among them; one law shall be to you for him who acts in error.”
- Torrey's Topical Textbook “Torrey's Topical Textbook: First Born, The — Of man and beast dedicated to God -- Ex 13:2,12; 22:29. Dedicated to commemorate the sparing of the first born of Israel -- Ex 13:15; Nu 3:13; 8:17. Of clean beasts Not to labour. -- De 15:19. Not shorn. -- De 15:19. Not taken from the dam for seven days. -- Ex 22:30; Le 22:27. Offered in sacrifice. -- Nu 18:17. Could not be a free-will offering. -- Le 27:26. Antiquity of offering. -- Ge 4:4. Flesh of, the priest's portion. -- Nu 18:18. Of clean beasts To be redeemed. -- Nu 18:15. Law of redemption for. -- Nu 18:16. Of the ass to be redeemed with la”
- Smith's Bible Dictionary “Smith's Bible Dictionary: Concubine — The difference between wife and concubine was less marked among the Hebrews than among us, owing to the absence of moral stigma. The difference probably lay in the absence of the right of the bill of divorce, without which the wife could not be repudiated. With regard to the children of wife and of concubine, there was no such difference as our illegitimacy implies. The latter were a supplementary family to the former; their names occur in the patriarchal genealogies, (Genesis 22:24; 1 Chronicles 1:22) and their position and provision would depend on the f”
- Exodus “Exodus 13:2 (LEB) — “Consecrate to me every firstborn, the first offspring of every womb among the ⌞Israelites⌟, among humans and among domestic animals; ⌞it belongs to me⌟.””
- Romans (Baptist/Reformed) “John Gill on Romans 8:17: And if children, then heirs,.... Children, whether natural or adopted, are heirs to their parents, and according to the Roman laws, which some think the apostle here respects, whether male or female; but according to the Jewish laws (c), females did not inherit only in case of want of male issue; for though Job's daughters inherited with his sons, this was a peculiar case; and the Jewish writers say (d), it was , "on account of their worth and beauty"; yet adopted children among them, whether male or female, were equal to natural children in possessing the inheritance”
- Schaff ANF/NPNF (Patristic) “NPNF1 Vol 6: Augustine — Homilies on the Gospels — OF THE AGREEMENT OF THE EVANGELISTS MATTHEW AND LUKE IN THE GENERATIONS OF THE LORD. (part 27): of the will also, should give birth to a child. For women, if they had no children of their own, used to adopt children born of their husbands by their hand-maids, and even oblige their husbands to give them children in this way; as Sarah, Rachel, and Leah.(6) And in doing this the husbands did not commit adultery, in that they obeyed their wives in that matter which had regard to conjugal duty, according to what the Apostle saith: "The wife hath no”
- Deuteronomy (Baptist/Reformed) “John Gill on Deuteronomy 21:17: But he shall acknowledge the son of the hated for the firstborn,.... Own him and declare him to be so, both by his will and the division of goods by him; or he shall "separate" him, as Onkelos; distinguish him from all his other sons, and make known to all, as the Targum of Jonathan, that he is his firstborn: by giving him a double portion of all that he hath; or, "that is found with him" (t); which he was in the possession of when he made his will, or divided his goods; and so refers not to what might come into his hands afterwards, or should be his in revers”
- theology (Catholic (Scholastic)) “Aquinas, Summa Theologica, Supplement (Supplementum), Of Illegitimate Children, Art. 1: Article: Whether children born out of true marriage are illegitimate? I answer that, Children are of four conditions. Some are natural and legitimate, for instance those who are born of a true and lawful marriage; some are natural and illegitimate, as those who are born of fornication; some are legitimate and not natural, as adopted children; some are neither legitimate nor natural; such are those born of adultery or incest, for these are born not only against the positive law, but against the express natur”