Kumbukumbu La Torati 21:16

wakati anapotoa wosia wa mali yake kwa wanawe, kamwe asitoe haki za mzaliwa wa kwanza kwa mwana wa mke ampendaye kwa upendeleo, badala ya mzaliwa hasa wa kwanza, ambaye ni mwana wa mke ambaye hampendi.

Then it shall be, when he maketh his sons to inherit that which he hath, that he may not make the son of the beloved firstborn before the son of the hated, which is indeed the firstborn: