Mark 14:39

But when ye pray, use not vain repetitions, as the heathen do: for they think that they shall be heard for their much speaking.

He went away again the second time, and prayed, saying, O my Father, if this cup may not pass away from me, except I drink it, thy will be done. And he came and found them asleep again: for their eyes were heavy. And he left them, and went away again, and prayed the third time, saying the same words.

And he spake a parable unto them to this end, that men ought always to pray, and not to faint;

For this thing I besought the Lord thrice, that it might depart from me.