'Cleansing' in the Bible

and saith unto him, See thou say nothing to any man: but go show thyself to the priest, and offer for thy cleansing the things which Moses commanded, for a testimony unto them.

And he charged him to tell no man: but go thy way, and show thyself to the priest, and offer for thy cleansing, according as Moses commanded, for a testimony unto them.

and he made no distinction between us and them, cleansing their hearts by faith.

For he that lacketh these things is blind, seeing only what is near, having forgotten the cleansing from his old sins.