Leviticus 22:1

1 And the LORD spoke to Moses, saying,

2 Speak to Aaron and to his sons, that they separate themselves from the holy things of the children of Israel, and that they profane not my holy name [in those things] which they hallow to me: I [am] the LORD.

3 Say to them, Whoever [he may be] of all your seed among your generations, that approacheth the holy things, which the children of Israel hallow to the LORD, having his uncleanness upon him, that soul shall be cut off from my presence: I [am] the LORD.

4 Whatever man of the seed of Aaron [is] a leper, or hath a running issue; he shall not eat of the holy things, until he is clean. And whoever toucheth any thing [that is] unclean [by] the dead, or a man whose seed goeth from him;