24 So when Pilate saw that he was gaining nothing, but rather that a riot was beginning, he took water and washed his hands before the crowd, saying, “I am innocent of this righteous man’s blood; see to it yourselves.” 25 And all the people answered, “His blood be on us and on our children!” 26 Then he released for them Barabbas, and having scourged Jesus, delivered him to be crucified.
I've always found that ironic ... as Christians we speak of being washed clean, or of having our robes washed clean, in the Blood of The Lamb. I think of the Centurion who stabbed his spear into Jesus' side, while His body hung on the cross. The Centurion certainly got some of Jesus' blood and water on him ... what an honor! Pious tradition names him Longinus, and holds him as one of the earliest Christians.
His Blood be upon us indeed!