All the first-born that shall be brought forth among thy cattle and among thy sheep, the male thou shalt consecrate to Jehovah thy God: thou shalt not work with the first-born of thy bullock, and thou shalt not shear first-born of thy sheep.

And it was in the day of his causing his sons to inherit what shall be to him, he shall, not be able to make the son of the loved first-born before the son of the hated, the first-born:

But he shall acknowledge the son of the hated, the first-born, to give to him the portion of two in all that shall be found to him; for he is the beginning of his strength; to him is the judgment of the first-born.

And it is the first-born which she shall bear shall rise up upon the name of his brother the dead, and his name shall not be wiped from Israel