Mark 14:35 (KJV)

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.

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.

And they came to a place which was named Gethsemane: and he saith to his disciples, Sit ye here, while I shall pray.

And he taketh with him Peter and James and John, and began to be sore amazed, and to be very heavy;

And saith unto them, My soul is exceeding sorrowful unto death: tarry ye here, and watch.

And he said, Abba, Father, all things are possible unto thee; take away this cup from me: nevertheless not what I will, but what thou wilt.

And he cometh, and findeth them sleeping, and saith unto Peter, Simon, sleepest thou? couldest not thou watch one hour?

Watch ye and pray, lest ye enter into temptation. The spirit truly is ready, but the flesh is weak.

And again he went away, and prayed, and spake the same words.

And when he returned, he found them asleep again, (for their eyes were heavy,) neither wist they what to answer him.