The first-fruits of thy grain, of thy new wine, and of thine oil, and the first of the fleece of thy sheep, thou shall give him.

then it shall be, in the day that he causes his sons to inherit that which he has, that he may not make the son of the beloved the first-born before the son of the one regarded inferior, who is the first-born.

But he shall acknowledge the first-born, the son of the one regarded inferior, by giving him a double portion of all that he has, for he is the beginning of his strength. The right of the first-born is his.