“And, behold, the angel of the Lord came upon him, and a light shined in the prison: and he smote Peter on the side, and raised him up, saying, Arise up quickly. And his chains fell off from his hands.”
King James Version (KJV)
12:7 His chains - With which his right arm was bound to one of the soldiers, and his left arm to the other.
Ac 12:7 The angel of the Lord. Coming in answer to prayer. Smote Peter. To arouse him.