68 But he denied it, saying, "I do not know or understand what you are talking about." And he went out into the forecourt. Then the cock crowed. 69 And the servant-girl, on seeing him, began again to say to the bystanders, "This man is one of them." 70 But again he denied it. Then after a little while the bystanders again said to Peter, "Certainly you are one of them; for you are a Galilean." 71 But he began to curse, and he swore an oath, "I do not know this man you are talking about." 72 At that moment the cock crowed for the second time. Then Peter remembered that Jesus had said to him, "Before the cock crows twice, you will deny me three times." And he broke down and wept.
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.