68 and he denied, saying, 'I have not known 'him', neither do I understand what thou sayest;' and he went forth without to the porch, and a cock crew. 69 And the maid having seen him again, began to say to those standing near—'This is of them;' 70 and he was again denying. And after a little again, those standing near said to Peter, 'Truly thou art of them, for thou also art a Galilean, and thy speech is alike;' 71 and he began to anathematize, and to swear—'I have not known this man of whom ye speak;' 72 and a second time a cock crew, and Peter remembered the saying that Jesus said to him—'Before a cock crow twice, thou mayest deny me thrice;' and having thought thereon—he was weeping.
Matthew Henry's Commentary on Mark 14:68-72
Commentary on Mark 14:66-72
(Read Mark 14:66-72)
Peter's denying Christ began by keeping at a distance from him. Those that are shy of godliness, are far in the way to deny Christ. Those who think it dangerous to be in company with Christ's disciples, because thence they may be drawn in to suffer for him, will find it much more dangerous to be in company with his enemies, because there they may be drawn in to sin against him. When Christ was admired and flocked after, Peter readily owned him; but will own no relation to him now he is deserted and despised. Yet observe, Peter's repentance was very speedy. Let him that thinketh he standeth take heed lest he fall; and let him that has fallen think of these things, and of his own offences, and return to the Lord with weeping and supplication, seeking forgiveness, and to be raised up by the Holy Spirit.