'Clean' in the Bible

They offer burnt sacrifices to the Lord every morning and every evening, along with fragrant incense. They arrange the Bread of the Presence on a ritually clean table and light the lamps on the gold lampstand every evening. Certainly we are observing the Lord our God's regulations, but you have rejected him.

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."