Leviticus 15:10

15:10 Anyone who touches anything that was under him will be unclean until evening, and the one who carries those items must wash his clothes, bathe in water, and be unclean until evening.

Leviticus 22:27

22:27 “When an ox, lamb, or goat is born, it must be under the care of its mother seven days, but from the eighth day onward it will be acceptable as an offering gift to the Lord.