All the firstling males that are born of thy herd and of thy flock thou shall sanctify to LORD thy God. Thou shall do no work with the firstling of thy herd, nor shear the firstling of thy flock.

If a man has two wives, the one beloved, and the other regarded inferior, and they have borne him sons, both the beloved and the one regarded inferior, and if the first-born son be hers who was regarded inferior,

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.

The sons of the third generation who are born to them shall enter into the assembly of LORD.

And it shall be, that the first-born who she bears shall succeed in the name of his brother who is dead, that his name be not blotted out of Israel.