The idea of purity is also associated with his plea that Jehovah wash him that he might become entirely clean, whiter even than snow that has not gathered soot or other debris.
Puhastamise mõte on seotud ka tema anuva palvega, et Jehoova peseks teda, nii et ta võiks saada täiesti puhtaks, veel valgemaks kui lumi, millele pole langenud tahma ega mingit muud mustust.