Psalm 51:7 in the World English Bible
Purify me with hyssop, and I will be clean. Wash me, and I will be whiter than snow.
Context
6 Behold, thou desirest truth in the inward parts: and in the hidden part thou shalt make me to know wisdom.
7 Purge me with hyssop, and I shall be clean: wash me, and I shall be whiter than snow.
8 Make me to hear joy and gladness; that the bones which thou hast broken may rejoice.