Leviticus 22:4-5

4Whatever 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;1

5Or whoever toucheth any creeping thing, by which he may be made unclean, or a man of whom he may take uncleanness, whatever uncleanness he hath;