Acts 12:4

To four quaternions of soldiers— That is, to sixteen, consisting of four in each party, who were to watch him by turns, four at a time; two of them being chained to him, and two of them watching before the door of the prison: one end of one chain was fastened to St. Peter's right hand, and the other end to the left arm of one of the soldiers; the other chain was in like manner fastened to St. Peter's left arm, and to the soldier's right arm: see Acts 12:6. Very likely the Jews remembered how all the apostles had escaped when they had formerly put them in prison; and perhaps they suspected the fidelity of the guards. It was therefore most probably at their request, that such a number of soldiers were appointed to guard the apostle. But the confining him was not all; for Herod intended after the Paschal Lamb was eaten, and the seven days festival quite finished, to bring him out to the people, and gratify them by putting him to death, and that publicly. During the festival the Jews used to spend their time in such mirth and festivity, that prisoners were commonly released, rather than executed. But notwithstanding all their zeal about rituals, they could submit to be concerned in the vilest immoralities. See chap. Acts 28:16. Instead of after Easter, the Greek would more properly be rendered after the passover.