Found in Matthew 26:30:35, Mark 14:27-31, Luke 22:31-33 and John 13:36-37
When they had sung a hymn, they went out into the mount of Olives.
Jesus: All of you shall be offended because of me this night: for it is written, I will smite the shepherd, and the sheep of the flock shall be scattered abroad. (Zechariah 13:7) But after I am risen again, I will go before you into Galilee.
Peter: Though all men shall be offended because of you, yet I will never be offended.
Simon Peter: Lord, where do you go?
Jesus: Where I go, you can not follow me now; but you shall follow me afterwards.
Peter: Lord, why can’t I follow you now? I will lay down my life for your sake.
The Lord: Simon, Simon, behold, Satan has desired to have you, that he may sift you as wheat: But I have prayed for you, that your faith fail not: and when you are converted, strengthen your brothers.
Peter: Lord, I am ready to go with you, both into prison and to death.
Jesus: (Will you lay down your life for my sake? – John) Truly, this night, before the cock crow (twice – Mark), you shall deny (that you know – Luke) me three times.
Peter (more vehemently – Mark): Though I should die with you, yet will I not deny you.
Likewise also said all the disciples.