Acts 12:4

Four quaternions of soldiers: there were sixteen soldiers appointed to keep Peter; the Romans using four soldiers at a time to keep sentry, and the Jews dividing their nights into four watches, there were enough to relieve the other, and to set a new watch as often as was required for every night; of which four at a time, two were with the prisoner, and perhaps, for the greater security, bound with the same chain, and two did always stand at the door or gate; and this they might the rather do, out of great caution, having heard what miracles Peter did, and that he had been delivered by an angel out of prison, Acts 5:19. After Easter; that day in which the paschal lamb was ate, on which the Jews would put none to death, that they might not eclipse the joy of that day. Bring him forth to the people; to do with him what they would, leaving him to their mercy, or rather cruelty.