Exodus 22:30
Likewise shall you do with your oxen, and with your sheep: seven days it shall be with its mother; on the eighth day you shall give it to me.
Leviticus 22:27
When a bullock, or a sheep, or a goat, is born, then it shall be seven days with the mother; and from the eighth day and thereafter it shall be accepted for an offering made by fire unto the LORD.
Deuteronomy 15:19
All the firstborn males that come of your herd and of your flock you shall sanctify unto the LORD your God: you shall do no work with the firstborn of your bullock, nor shear the firstborn of your sheep.
Exodus 13:12
That you shall set apart unto the LORD all that opens the womb, and every firstling that comes of a beast which you have; the males shall be the LORD'S.
Leviticus 12:3
And in the eighth day the flesh of his foreskin shall be circumcised.