The first-fruit also of thy corn, of thy wine, and of thy oil, and the first of the fleece of thy sheep, shalt thou give him.

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

But he shall acknowledge the son of the hated for the first-born, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the first-born is his.