Jesus said to him, "Truly I tell you, this very night, before the cock crows, you will deny me three times."
Peter said to him, "Even though I must die with you, I will not deny you." And so said all the disciples.
Then Jesus went with them to a place called Gethsemane; and he said to his disciples, "Sit here while I go over there and pray."
He took with him Peter and the two sons of Zebedee, and began to be grieved and agitated.
Then he said to them, "I am deeply grieved, even to death; remain here, and stay awake with me."
And going a little farther, he threw himself on the ground and prayed, "My Father, if it is possible, let this cup pass from me; yet not what I want but what you want."
Then he came to the disciples and found them sleeping; and he said to Peter, "So, could you not stay awake with me one hour?
Stay awake and pray that you may not come into the time of trial; the spirit indeed is willing, but the flesh is weak."
References for Matthew 26:41
Again he went away for the second time and prayed, "My Father, if this cannot pass unless I drink it, your will be done."
Again he came and found them sleeping, for their eyes were heavy.
So leaving them again, he went away and prayed for the third time, saying the same words.