|Luke 22:31  And the Lord said, Simon, Simon, behold, Satan hath desired to have you, that he may sift you as wheat: 32 But I have prayed for thee , that thy faith fail not: and when thou art converted, strengthen thy brethren.||John 13:36 Simon Peter said unto him, Lord, whither goest thou? Jesus answered him, Whither I go, thou canst not follow me now; but thou shalt follow me afterwards.|
|Mark 14:29 But Peter said unto him, Although all shall be offended, yet will not I.||Matt 26:33 Peter answered and said unto him, Though all men shall be offended because of thee, yet will I never be offended.||Luke 22:33 And he said unto him, Lord, I am ready to go with thee, both into prison, and to death.||John 13:37 Peter said unto him, Lord, why cannot I follow thee now? I will lay down my life for thy sake.|
|Mark 14:30 And Jesus saith unto him, Verily I say unto thee, That this day, even in this night, before the cock crow twice, thou shalt deny me thrice.||Matt 26:34 Jesus said unto him, Verily I say unto thee, That this night, before the cock crow, thou shalt deny me thrice.||Luke 22:34 And he said, I tell thee, Peter, the cock shall not crow this day, before that thou shalt thrice deny that thou knowest me.||John 13:38 Jesus answered him, Wilt thou lay down thy life for my sake? Verily, verily, I say unto thee, The cock shall not crow, till thou hast denied me thrice.|
|Mark 14:31 But he spake the more vehemently, If I should die with thee, I will not deny thee in any wise. Likewise also said they all.||Matt 26:35 Peter said unto him, Though I should die with thee, yet will I not deny thee. Likewise also said all the disciples.|
Luke and John's transitions to this prophecy of Peter's betrayal cannot be reconciled with Mark and Matthew or with each other.
This is the only place in Luke where Jesus prays for someone else. In John, he mentions praying for others or offers to pray for them in a number of places (14:16, 16:26, 17:9, 17:15, 17:20).