TSK · Deuteronomy 21:6

If I wash myself with snow, and cleanse my hands with lye,

I will wash my hands in innocence, so I will go about your altar, Yahweh;

Purify me with hyssop, and I will be clean. Wash me, and I will be whiter than snow.

Surely in vain I have cleansed my heart, and washed my hands in innocence,

So when Pilate saw that nothing was being gained, but rather that a disturbance was starting, he took water, and washed his hands before the multitude, saying, "I am innocent of the blood of this righteous person. You see to it."