Matthew 26:44

"And he left them, and went away again, and prayed the third time, saying the same words."

Cross References (ranked by relevance)

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

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

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