TSK · Hebrews 9:13

And do this to them to purify them: Sprinkle water of purification on them; then have them shave all their body and wash their clothes, and so purify themselves.

everyone who has determined to follow God, the LORD God of his ancestors, even if he is not ceremonially clean according to the standards of the temple.”

After a priest has become ceremonially clean, they must count off a period of seven days for him.

You have purified your souls by obeying the truth in order to show sincere mutual love. So love one another earnestly from a pure heart.