תְּחַטְּאֵ֣נִי בְאֵז֣וֹב וְאֶטְהָ֑ר תְּ֝כַבְּסֵ֗נִי וּמִשֶּׁ֥לֶג אַלְבִּֽין׃
Purge me with hyssop, and I shall be clean; wash me, and I shall be whiter than snow.
Read kabbalistic (mystical) interpretation of Psalms 51:9: and classical mystical sources.