Note 12 at Acts 12:15: The disciples were praying for Peter, and yet when he was reported as being freed from prison they didn't believe it. Either they were not praying for his release, or they had hardened hearts that caused them to be amazed when they saw the miraculous, such as the disciples had in Mark 6:51 (see note 10 at Mk. 6:52, p. 238).

Note 13 at Acts 12:15: They didn't say it is an angel but rather, it is his angel. This reflects their belief that everyone has his own angel assigned to him by the Lord. Jesus made reference to a child's angel beholding the Lord's face continually, ready to minister on that child's behalf (see note 3 at Mt. 18:10, p. 275).