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.”
So they decided to use the money to buy the potter’s field as a burial place for foreigners.
That is why it has been called the Field of Blood to this day.
References for Matthew 27:8
Then what was spoken by Jeremiah the prophet was fulfilled: “They took the thirty pieces of silver, the price set on him by the people of Israel,
References for Matthew 27:9
and they used them to buy the potter’s field, as the Lord commanded me.”
References for Matthew 27:10