Deuteronomy 21:17

Rather, he must acknowledge the son of the less loved ¹  wife as firstborn and give him the double portion ²  of all he has, for that son is the beginning of his father’s procreative power ³  – to him should go the right of the firstborn.

Ge 25:5,6,32,34; Ge 25:31-34; Ge 49:3; 1Ch 5:1,2; Ps 105:36

¹ tn See note on the word “other” in v. 15.

² tn Heb “measure of two.” The Hebrew expression פִּי שְׁנַיִם (piy shÿnayim) suggests a two-thirds split; that is, the elder gets two parts and the younger one part. Cf. 2 Kgs 2:9; Zech 13:8. The practice is implicit in Isaac’s blessing of Jacob (Gen 25:31-34) and Jacob’s blessing of Ephraim (Gen 48:8-22).

³ tn Heb “his generative power” (אוֹן, ’on; cf. HALOT 22 s.v.). Cf. NAB “the first fruits of his manhood”; NRSV “the first issue of his virility.”