Deuteronomy 21:15

15 "If a man has two wives, the one loved and the other unloved, and both the loved and unloved wives have borne him children, and if the firstborn son is the child of the unloved wife;

Deuteronomy 21:15 Meaning and Commentary

Deuteronomy 21:15

If a man have two wives
Which is supposed, but not approved of, though permitted because of the hardness of men's hearts; for it was not so from the beginning, when only one man and one woman were created, and joined together in marriage; but as it was connived at, and become customary, a law is made to prevent confusion, and preserve order in families:

one beloved and another hated;
or less loved, yet continued his wife, and not divorced. Aben Ezra observes, this follows upon the former, because it is there said, that though first he had a desire to her (the captive beautiful woman), yet afterwards had no delight in her:

and they have borne him children both, the beloved and the hated;
as Rachel and Leah did to Jacob, who were, the one very much beloved by him, and the other less:

and if the firstborn son be hers that was hated;
or not so much beloved as the other, as was the case in the above instance.

Deuteronomy 21:15 In-Context

13 and remove her prison clothing. She will stay there in your house, mourning her father and mother for a full month; after which you may go in to have sexual relations with her and be her husband, and she will be your wife.

14 In the event that you lose interest in her, you are to let her go wherever she wishes; but you may not sell her for money or treat her like a slave, because you humiliated her.

15 "If a man has two wives, the one loved and the other unloved, and both the loved and unloved wives have borne him children, and if the firstborn son is the child of the unloved wife;

16 then, when it comes time for him to pass his inheritance on to his sons, he may not give the inheritance due the firstborn to the son of the loved wife in place of the son of the unloved one, who is in fact the firstborn.

17 No, he must acknowledge as firstborn the son of the unloved wife by giving him a double portion of everything he owns, for he is the firstfruits of his manhood, and the right of the firstborn is his.