Exodus 22:30
You shall do the same with your oxen and with your sheep. It shall be with its mother for seven days; on the eighth day you shall give it [as an offering] to Me.
Leviticus 22:27
“When a bull or a sheep or a goat is born, it shall remain for seven days with its mother; and after the eighth day it shall be accepted as an offering by fire to the Lord.
Deuteronomy 15:19
“You shall consecrate (set apart) to the Lord your God all the firstborn males that are born of your herd and flock. You shall not work with the firstborn of your herd, nor shear the firstborn of your flock.
Exodus 13:12
you shall set apart and dedicate to the Lord all that first opens the womb. All the firstborn males of your livestock shall be the Lord’s.
Leviticus 12:3
On the eighth day the flesh of the male child’s foreskin shall be circumcised.