Peter denies Jesus...
The Gospel of Luke is the only Gospel that records that Jesus looked at Peter when Peter denied knowing Him - which Jesus had predicted Peter would do.
Peter is quite anguished at what he has done. A very moving passage.
First, Jesus’ prediction:
“And he said unto him, Lord, I am ready to go with thee, both into prison, and to death.
And he said, I tell thee, Peter, the cock shall not crow this day, before that thou shalt thrice deny that thou knowest me.”
(Luke 22:33-34)
The fulfillment of Jesus’ prediction:
“Then took they him, and led him, and brought him into the high priest's house. And Peter followed afar off.
And when they had kindled a fire in the midst of the hall, and were set down together, Peter sat down among them.
But a certain maid beheld him as he sat by the fire, and earnestly looked upon him, and said, This man was also with him.
And he denied him, saying, Woman, I know him not.
And after a little while another saw him, and said, Thou art also of them. And Peter said, Man, I am not.
And about the space of one hour after another confidently affirmed, saying, Of a truth this fellow also was with him: for he is a Galilaean.
And Peter said, Man, I know not what thou sayest. And immediately, while he yet spake, the cock crew.
And the Lord turned, and looked upon Peter. And Peter remembered the word of the Lord, how he had said unto him, Before the cock crow, thou shalt deny me thrice.
And Peter went out, and wept bitterly.”
(Luke 22:54-62)