To wash one's hands of innocent blood

 Gospel of Matthew

27:24

The emperor of Rome's

representative,

Pontius Pilate,

took water and washed his

hands in front of the crowd

saying,

'I am innocent of this

man's blood;  you see to it!"

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INTERTEXTUAL connection to

Psalm 25: 6 LXX

I will wash my hands in innocence