Deuteronomy 21:15-17

Douay-Rheims 1899 American Edition

¹⁵ If a man have two wives, one beloved, and the other hated, and they have had children by him, and the son of the hated be the firstborn,

¹⁶ And he meaneth to divide his substance among his sons: he may not make the son of the beloved the firstborn, and prefer him before the son of the hated.

¹⁷ But he shall acknowledge the son of the hated for the firstborn, and shall give him a double portion of all he hath: for this is the first of his children, and to him are due the first birthrights.