Leviticus 22:2-3

2“Tell Aaron and his sons to be careful with the holy things (offerings, gifts) which the children of Israel dedicate to Me, so that they do not profane My holy name; I am the Lord.

3Say to them, ‘Any one of your descendants throughout your generations who approaches the holy things which the Israelites dedicate to the Lord, while he is [ceremonially] unclean, that person shall be cut off from My presence and excluded from the sanctuary; I am the Lord.