So, they conferred together [and decided] to buy "The Potter's Field" with the money [Note: This was probably an abandoned field where clay had been obtained for making pottery], for use in burying people who were not from the local area. So, that field is called, "The Field of Blood" to this day. read more.
[Thus the prophecy] spoken by Jeremiah, the prophet [Note: The passage actually appears to be Zech. 11:12-13], was fulfilled which said, "And they took the thirty silver coins, the amount charged for Him on whom certain Israelites had set a price, and gave the money for 'The Potter's Field,' as the Lord directed me."