Exodus 22:30
You must also do this for your oxen and for your sheep; seven days they may remain with their mothers, but give them to me on the eighth day.
Leviticus 22:27
"When an ox, lamb, or goat is born, it must be under the care of its mother seven days, but from the eighth day onward it will be acceptable as an offering gift to the Lord.
Deuteronomy 15:19
You must set apart for the Lord your God every firstborn male born to your herds and flocks. You must not work the firstborn of your bulls or shear the firstborn of your flocks.
Exodus 13:12
then you must give over to the Lord the first offspring of every womb. Every firstling of a beast that you have -- the males will be the Lord's.
Leviticus 12:3
On the eighth day the flesh of his foreskin must be circumcised.