Bible Verses About Priests: While unclean could not perform any service

And Jehovah spake unto Moses, saying,

Speak unto Aaron and to his sons, that they separate themselves from the holy things of the children of Israel, which they hallow unto me, and that they profane not my holy name: I am Jehovah.

and the priest shall take cedar-wood, and hyssop, and scarlet, and cast it into the midst of the burning of the heifer.

Then the priest shall wash his clothes, and he shall bathe his flesh in water, and afterward he shall come into the camp, and the priest shall be unclean until the even.