Exodus 22:30
You will do likewise for your ox and for your sheep and goats; seven days it will be with its mother; on the eighth, you will give it to me.
Leviticus 22:27
"When an ox or a sheep or a goat is born, then it shall be under its mother [for] seven days, and from the eighth day and beyond it is acceptable as an offering made by fire for Yahweh.
Deuteronomy 15:19
"Every firstling male that is born of your herd and of your flock you shall consecrate to Yahweh your God; you shall not do work with the firstling of your ox, and you shall not shear the firstling of your flock.
Exodus 13:12
you will hand over every first offspring of a womb to Yahweh, and every first offspring dropped by a domestic animal that will belong to you, the males [will be] for Yahweh.
Leviticus 12:3
And on the eighth day his foreskin's flesh shall be circumcised.