Ye have a watch - The Jews had a guard of Roman soldiers, who kept watch in the tower of Antonia, on the northwest of the temple. Pilate either referred to these, or to the “watch” that attended the crucifixion - the whole “band” that had been appointed for that. As the torments of crucifixion sometimes lasted many days, the band had been probably granted to them during that time, and they were therefore still at the direction of the chief priests.
Related Commentaries of Matthew 27:65
Matthew 27:65
65 Pilate said unto them, Ye have a watch: go your way, make it as sure as ye can.