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

And the Lord spoke to Moses saying:

Speak to Aaron and to his sons, that they beware of those things that are consecrated of the children of Israel: and defile not the name of the things sanctified to me, which they offer. I am the Lord.

The priest shall also take cedar wood, and hyssop, and scarlet twice dyed, and cast it into the flame, with which the cow is consumed.

And then after washing his garments, and body, he shall enter into the camp, and shall be unclean until the evening.