Leviticus 22:4-6

Amplified Bible

⁴ No man of the descendants of Aaron who is a leper or has a discharge may eat the holy things [the offerings and the showbread] until he is clean. And whoever touches any person or thing made unclean by contact with a corpse or a man who has had a seminal emission, ⁵ or whoever touches any crawling thing by which he is made unclean, or any person by whom he is made unclean, whatever it may be,^{(A) 6} the person who touches any such thing shall be unclean until evening and shall not eat the holy things unless he has bathed his body in water.^(B)