Exodus 22:30
Thus, shalt thou do with thine ox with thy sheep, a seven days, shall it be with its dam, on the eighth day, shalt thou give it to me.
Leviticus 22:27
When, a beeve or a sheep or a goat, is brought forth, then shall it be seven days under its dam, - and, from the eighth day and onwards, it shall be accepted as an oblation of an altar-flame unto Yahweh,
Deuteronomy 15:19
Every firstling that is brought forth in thy herd and in thy flock that is a male, shalt thou hallow unto Yahweh thy God, - thou shalt not work with a firstling of thine oxen, neither shalt thou shear a firstling of thy flock:
Exodus 13:12
that thou shalt set apart whatsoever is born first, to Yahweh; and, of all firstlings of beasts which thou shalt have, the males, shall pertain to Yahweh.
Leviticus 12:3
And, on the eighth day, shall the flesh of his foreskin be circumcised.