Exodus 22:30
Likewise shalt thou do with thy calf, with thy sheep: seven days shall it be with its dam; on the eighth day thou shalt give it me.
Leviticus 22:27
An ox, or a sheep, or a goat, when it is brought forth, shall be seven days under its dam; and from the eighth day and thenceforth it shall be accepted for an offering by fire to Jehovah.
Deuteronomy 15:19
Every firstling that is born among thy kine and among thy sheep that is a male, thou shalt hallow to Jehovah thy God: thou shalt do no work with the firstling of thy kine, nor shear the firstling of thy sheep.
Exodus 13:12
that thou shalt offer unto Jehovah all that breaketh open the womb, and every firstling that cometh of cattle which is thine: the males shall be Jehovah's.
Leviticus 12:3
And on the eighth day shall the flesh of his foreskin be circumcised.