Answer:
Then Peter remembered the word Jesus had spoken: "Before the rooster crows, you will disown me three times." And he went outside and wept bitterly. The Gospel of Luke 22:59-62 describes the moment of the last denial as follows: ... Simon Peter and another disciple were following Jesus.
Peter’s denial was based partially on weakness, the weakness born of human frailty. After the Last Supper, Jesus took His disciples to the Garden of Gethsemane to await His arrest. He told them to stay awake and pray while He went off to pray alone. When He returned to them, He found them sleeping. He warned Peter to stay awake and pray because, although his spirit might be willing, his flesh was weak. But he fell asleep again, and, by the time the soldiers had come to arrest Jesus, it was too late to pray for the strength to endure the ordeal to come. No doubt his failure to appropriate the only means to shore up his own weakness—prayer—occurred to him as he was weeping bitterly after his denials. But Peter learned his lesson about being watchful, and he exhorts us in 1 Peter 5:8, “Be on the alert, because your adversary, the devil, prowls around like a roaring lion, seeking someone to devour.” Peter’s weakness had caused him to be “devoured” momentarily as he denied his Lord because he hadn’t been prepared through prayer and he underestimated his own weakness
A second reason for Peter’s failure was fear. To his credit, although all the others had fled (Mark 14:50), Peter still followed Jesus after His arrest, but he kept his distance so as not to be identified with Him (Mark 14:54). There’s no question that fear gripped him. From the courtyard, he watched Jesus being falsely accused, beaten, and insulted (Mark 14:57–66). Peter was afraid Jesus would die, and he was fearful for his own life as well. The world hated Jesus, and Peter found that he was not prepared to face the ridicule and persecution that Jesus was suffering. Earlier, Jesus had warned His disciples as well as us today, “If the world hates you, keep in mind that it hated me first” (John 16:18; cf. Matthew 24:9). Peter quickly found he wasn’t nearly as bold and courageous as he had proclaimed, and in fear he denied the One who had loved him.
