John Calvin Commentary Matthew 27:10

"and they gave them for the potter`s field, as the Lord appointed me." — Matthew 27:10 (ASV)

As the Lord appointed me. By this clause Matthew confirms the statement that this was not done without the providence of God; because, while they have a different intention, they unconsciously fulfill an ancient prediction. For how could it have occurred to them to purchase a field from a potter, if the Lord had not turned their blameworthy conduct to execute His own purpose?