Acts 5:19

But an angel of the Lord by night opened the prison doors, and brought them out, and said,

'OPENED THE PRISON DOORS'-'An angel, whose very existence was denied by the Sadducees who had arrested the apostles, is the one who did it!' (Reese p. 214) (Acts 23:8) Seeing that the guards were completely ignorant of this escape (Acts 5:22-23) we must conclude that this was similar to the situation recorded in Acts 12:7.

Point to Note:

Now certain critics have complained that this was. useless miracle, seeing that the Apostles were found and brought back. But one writer notes, 'But not only was the miracle. source of fresh strength and faith to the disciples...Moreover, the deliverance was another indication to the Sadducees, if they would have accepted it, that it was useless for them to attempt to stay the movement.' (Gr. Ex. N.T. p. 149) This miracle proved, that indeed they were fighting against God (Acts 5:39).