Deuteronomy 21:16-17 Then it shall be, when he makes his sons to inherit that which he has, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn:

CKJV_Strongs⁽ⁱ⁾

16 H3117 Then it shall be, when H1121 he makes his sons H5157 to inherit H3201 that which he has, that he may H1121 not make the son H157 of the beloved H1069 firstborn H6440 before H1121 the son H8130 of the hated, H1060 which is indeed the firstborn:

17 H5234 But he shall acknowledge H1121 the son H8130 of the hated H1060 for the firstborn, H5414 by giving H8147 him a double H6310 portion H4672 of all that he has: H7225 for he is the beginning H202 of his strength; H4941 the right H1062 of the firstborn is his.