en_tn_lite_do_not_use/mat/27/24.md

he was gaining nothing

"he was doing no good" or "he was unable to convince the people"

washed his hands in front of the crowd

Pilate does this as a sign that he is not responsible for Jesus's death.

the blood

Alternate translation: "the death"

You see to it

This is an idiom that means "This is your responsibility."