Exodus 22:30
Likewise shalt thou do with thine oxen, and with thy sheep: seven days it shall be with its dam; on the eighth day thou shalt give it me.
Leviticus 22:27
When a bullock, or a sheep, or a goat, is brought forth, then it shall be seven days under the dam; and from the eighth day and thenceforth it shall be accepted for the oblation of an offering made by fire unto Jehovah.
Deuteronomy 15:19
All the firstling males that are born of thy herd and of thy flock thou shalt sanctify unto Jehovah thy God: thou shalt do no work with the firstling of thy herd, nor shear the firstling of thy flock.
Exodus 13:12
that thou shalt set apart unto Jehovah all that openeth the womb, and every firstling which thou hast that cometh of a beast; the males shall be Jehovah's.
Leviticus 12:3
And in the eighth day the flesh of his foreskin shall be circumcised.