Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.
Psalms 51:7
King James Version (public domain)
Traditionally attributed to David · c. 10th century BC · King of Israel; author of many Psalms (compiled with other writers)
Context
5Behold, I was shapen in iniquity; and in sin did my mother conceive me.
6Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.
7Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.
8Make me to hear joy and gladness; that the bones which thou hast broken may rejoice.
9Hide thy face from my sins, and blot out all mine iniquities.