Exodus 22:30
Likewise thou shall do with thine oxen, [and] with thy sheep. Seven days it shall be with its dam. On the eighth day thou shall 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 after that it shall be accepted for the oblation of an offering made by fire to LORD.
Deuteronomy 15:19
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.
Exodus 13:12
that thou shall set apart to LORD all that opens the womb. And every firstling which thou have that comes of a beast, the males shall be LORD's.
Leviticus 12:3
And in the eighth day the flesh of his foreskin shall be circumcised.