Leviticus 22:2

1 And the Lord said to Moses,

2 Give orders to Aaron and to his sons to keep themselves separate from the holy things of the children of Israel which they give to me, and not to make my holy name common: I am the Lord,

3 Say to them, If any man of all your seed through all your generations, being unclean, comes near the holy things which the children of Israel make holy to the Lord, he will be cut off from before me: I am the Lord.

4 No man of the seed of Aaron who is a leper, or who has a flow from his body, may take of the holy food till he is clean. And any man touching anything which is unclean because of the dead, or any man whose seed goes from him;

5 Or anyone touching any unclean thing which goes flat on the earth, or someone by whom he may be made unclean in any way whatever;

6 Any person touching any such unclean thing will be unclean till evening, and may not take of the holy food till his flesh has been bathed in water;

7 And when the sun has gone down he will be clean; and after that he may take part in the holy food, because it is his bread.