Acts 12:18

as soon as it was day, &c.--His deliverance must have been during the fourth watch (three to six A.M.); else he must have been missed by the keepers at the change of the watch [WIES].

In this chapter we have the story, I. Of the martyrdom of James the apostle, and the imprisonment of Peter by Herod Agrippa, who now reigned as king in Judea (Act 12:1-4). II. The miraculous deliverance of Peter out of prison by the ministry of an angel, in answer to the prayers of the church for him (Act 12:6-19). III. The cutting off of Herod in the height of his pride by the stroke of an angel, the minister of God's justice (Act 12:20-23); and this was done while Barnabas and Saul were at Jerusalem, upon the errand that the church of Antioch sent them on, to carry their charity; and therefore in the close we have an account of their return to Antioch (Act 12:24, Act 12:25).

12:18-23 When Peter couldn’t be found after a careful search, Herod interrogated the guards and put them to death (cp. 16:27). However, Herod met his own painful end as a divine judgment on his conceit when he accepted the people’s worship. Josephus records the death of Herod Agrippa I in greater detail (Josephus, Antiquities 19.8.1-2).