5 All the time that Peter was under heavy guard in the jailhouse, the church prayed for him most strenuously.
6 Then the time came for Herod to bring him out for the kill. That night, even though shackled to two soldiers, one on either side, Peter slept like a baby. And there were guards at the door keeping their eyes on the place. Herod was taking no chances! 7 Suddenly there was an angel at his side and light flooding the room. The angel shook Peter and got him up: "Hurry!" The handcuffs fell off his wrists. 8 The angel said, "Get dressed. Put on your shoes." Peter did it. Then, "Grab your coat and let's get out of here." 9 Peter followed him, but didn't believe it was really an angel - he thought he was dreaming. 10 Past the first guard and then the second, they came to the iron gate that led into the city. It swung open before them on its own, and they were out on the street, free as the breeze. At the first intersection the angel left him, going his own way.
Matthew Henry's Commentary on Acts 12:5-10
Commentary on Acts 12:1-5
(Read Acts 12:1-5)
James was one of the sons of Zebedee, whom Christ told that they should drink of the cup that he was to drink of, and be baptized with the baptism that he was to be baptized with, Matthew 20:23. Now the words of Christ were made good in him; and if we suffer with Christ, we shall reign with him. Herod imprisoned Peter: the way of persecution, as of other sins, is downhill; when men are in it, they cannot easily stop. Those make themselves an easy prey to Satan, who make it their business to please men. Thus James finished his course. But Peter, being designed for further services, was safe; though he seemed now marked out for a speedy sacrifice. We that live in a cold, prayerless generation, can hardly form an idea of the earnestness of these holy men of old. But if the Lord should bring on the church an awful persecution like this of Herod, the faithful in Christ would learn what soul-felt prayer is.
Commentary on Acts 12:6-11
(Read Acts 12:6-11)
A peaceful conscience, a lively hope, and the consolations of the Holy Spirit, can keep men calm in the full prospect of death; even those very persons who have been most distracted with terrors on that account. God's time to help, is when things are brought to the last extremity. Peter was assured that the Lord would cause this trial to end in the way that should be most for his glory. Those who are delivered out of spiritual imprisonment must follow their Deliverer, like the Israelites when they went out of the house of bondage. They knew not whither they went, but knew whom they followed. When God will work salvation for his people, all difficulties in their way will be overcome, even gates of iron are made to open of their own accord. This deliverance of Peter represents our redemption by Christ, which not only proclaims liberty to the captives, but brings them out of the prison-house. Peter, when he recollected himself, perceived what great things God had done for him. Thus souls delivered out of spiritual bondage, are not at first aware what God has wrought in them; many have the truth of grace, that want evidence of it. But when the Comforter comes, whom the Father will send, sooner or later, he will let them know what a blessed change is wrought.