Leviticus 22:1-5

Then the Lord spoke to Moses, saying,

“Tell Aaron and his sons to be careful with the holy gifts of the sons of Israel, which they dedicate to Me, so as not to profane My holy name; I am the Lord.

Say to them, ‘Any man among all your descendants throughout your generations who approaches the holy gifts which the sons of Israel consecrate to the Lord, while he has an uncleanness, that person shall be cut off from My presence; I am the Lord.

No man of the descendants of Aaron, who has leprosy or has a discharge, may eat of the holy gifts until he is clean. And one who touches anything made unclean by a corpse, or a man who has a seminal emission,

or a man who touches any swarming things by which he is made unclean, or touches any person by whom he is made unclean, whatever his uncleanness;