Peter's fall, which is here related, is a bright mirror of our weakness. In his repentance, also, a striking instance of the goodness and mercy of God is held out to us. This narrative, therefore, which relates to a single individual, contains a doctrine which may be applied to the whole Church, and which indeed is highly useful, both to instruct those who are standing to cherish anxiety and fear, and to comfort those who have fallen, by holding out to them the hope of pardon. And first it ought to be observed, that Peter acted inconsiderately, when he entered into the hall of the high priest. It was his duty, no doubt, to follow his Master; but having been warned that he would revolt, he ought rather to have concealed himself in some corner, so as not to expose himself to an occasion of sinning. Thus it frequently happens that believers, under an appearance of virtue, throw themselves within the reach of temptation. It is therefore our duty to pray to the Lord to restrain and keep us by his Spirit, lest, going beyond our measure, we be immediately punished. We ought also to pray, whenever we commence any undertaking, that he may not permit us to fail in the midst of our efforts, or at the beginning of the work, but may supply us with strength from heaven till the end. Conviction of our weakness ought not, indeed, to be a reason for indolence, to prevent us from going wherever God calls us; but it ought to restrain our rashness, that we may not attempt any thing beyond our calling; and it ought also to stimulate us to prayer, that God, who has given us grace to begin well, may also continue to give us grace to persevere.

And when they had kindled a fire in the midst of the hall,.... It being cold in the night time, though it was at the passover, and the beginning of harvest, the servants and officers of the high priest made a fire in the middle of the hall, whilst Jesus was examining before the sanhedrim, at the other end of it:
and were sat down together; about it, as the Syriac version adds, to warm themselves:
Peter sat down among them; for the same purpose, and as if he was one of them; and which he might do, not only to warm himself, but to prevent his being taken notice of, and suspected; as he might have been, had he been loitering about.