When Judas, who had betrayed him, saw that Jesus was condemned, he was seized with remorse and returned the thirty pieces of silver to the chief priests and the elders.
References for Matthew 27:3
“I have sinned,” he said, “for I have betrayed innocent blood.” “What is that to us?” they replied. “That’s your responsibility.”
References for Matthew 27:4
So Judas threw the money into the temple and left. Then he went away and hanged himself.
References for Matthew 27:5
The chief priests picked up the coins and said, “It is against the law to put this into the treasury, since it is blood money.”