TSK · Exodus 29:35

Seven days you shall make atonement for the altar, and sanctify it: and the altar shall be most holy; whatever touches the altar shall be holy.

"You shall bring Aaron and his sons to the door of the Tent of Meeting, and shall wash them with water.

"He who is to be cleansed shall wash his clothes, and shave off all his hair, and bathe himself in water; and he shall be clean. After that he shall come into the camp, but shall dwell outside his tent seven days.