Leviticus 22:2; Leviticus 22:3

2 “Tell Aaron and his sons to treat with respect the sacred offerings the Israelites consecrate to me, so they will not profane my holy name. I am the LORD.

3 “Say to them: ‘For the generations to come, if any of your descendants is ceremonially unclean and yet comes near the sacred offerings that the Israelites consecrate to the LORD, that person must be cut off from my presence. I am the LORD.