Matthew 27:3-5

3Then Judas, who delivered him up, seeing that he had been condemned, filled with remorse, returned the thirty pieces of silver to the chief priests and the elders,

4saying, I have sinned [in] having delivered up guiltless blood. But they said, What is that to us? see thou [to that].

5And having cast down the pieces of silver in the temple, he left the place, and went away and hanged himself.