Then Judas, His betrayer, seeing that He had been condemned, was full of remorse and returned the 30 pieces of silver to the chief priests and elders.
References for Matthew 27:3
"I have sinned by betraying innocent blood," he said. "What's that to us?" they said. "See to it yourself!"
So he threw the silver into the sanctuary and departed. Then he went and hanged himself.
The chief priests took the silver and said, "It's not lawful to put it into the temple treasury, since it is blood money."
References for Matthew 27:6
So they conferred together and bought the potter's field with it as a burial place for foreigners.
Therefore that field has been called "Blood Field" to this day.
Then what was spoken through the prophet Jeremiah was fulfilled: They took the 30 pieces of silver, the price of Him whose price was set by the sons of Israel,
and they gave them for the potter's field, as the Lord directed me.
References for Matthew 27:10