Following the arrest of Jesus, Peter denied knowing him three times, but after the third denial, he heard the rooster crow and recalled the prediction as Jesus turned to look at him. Peter then began to cry bitterly. This final incident is known as the Repentance of Peter.

Who betrayed Jesus who denied Jesus?

Judas Iscariot was one of the Twelve Apostles. He is notorious for betraying Jesus by disclosing Jesus' whereabouts for 30 pieces of silver. Judas brought men to arrest Jesus and identified him with a kiss.

What is the main reason why Peter denied Jesus?

Peter was afraid of being arrested/killed.