Exodus 22:30
In the same way with your oxen and your sheep: for seven days let the young one be with its mother; on the eighth day give it to me.
Leviticus 22:27
When an ox or a sheep or a goat is given birth, let it be with its mother for seven days; and after the eighth day it may be taken as an offering made by fire to the Lord.
Deuteronomy 15:19
All the first males to come to birth in your herd and your flock are to be holy to the Lord your God: the first birth of your ox is not to be used for work, the wool of your first lamb is not to be cut.
Exodus 13:12
You are to put on one side for the Lord every mother's first male child, the first-fruit of her body, and the first young one of every beast; every male is holy to the Lord.
Leviticus 12:3
And on the eighth day let him be given circumcision.