Revelation 7:14 And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.

Isaiah 1:16 ¶Wash you, make you clean; put away the evil of your doings from before mine eyes; cease to do evil;

Psalms 51:6 Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.