And behold, the angel of the Lord came upon him,.... Suddenly and at once, and stood by him; this was one of the ministering spirits sent forth by Christ, to minister to a servant of his:and a light shined in the prison; the Syriac version renders it, "in the whole house"; and the word that is used does signify an habitation, or a dwelling house properly, but is used also by the Greek writers for a prison: this was an uncommon light produced by the angel, partly as an emblem of the presence, majesty, and power of God, who was present, to work a great deliverance; and partly for the use of Peter, that when being awaked he might see to rise and walk by:and he smote Peter on the side, and raised him up; he touched him on that side which lay uppermost, or punched him on it, in order to awake him, and raise him out of his sleep:saying arise up quickly; without delay, make haste:and his chains fell off from his hands; from both his hands, and were left with the soldiers, between whom he slept; which must be ascribed to an almighty power, which caused them to drop off.
Vid Harpocratian Lex. p.