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

Then the LORD said to Moses,

“Tell Aaron and his sons to treat with respect the sacred offerings that the Israelites have consecrated to Me, so that they do not profane My holy name. I am the LORD.

The priest is to take cedar wood, hyssop, and scarlet wool and throw them onto the burning heifer.

Then the priest must wash his clothes and bathe his body in water; after that he may enter the camp, but he will be ceremonially unclean until evening.