16 when he comes to bequeath his property to his sons he may not consider as his firstborn the son of the wife he loves, in preference to the son of the wife he does not love, the firstborn.

17 On the contrary, he shall recognize as his firstborn the son of the unloved wife, giving him a double share of whatever he happens to own, since he is the first fruits of his manhood, and to him belong the rights of the firstborn.

Deuteronomy 21:16-17, New American Bible Revised. Copyright © 2010 USCCB.
Deuteronomy 20
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