Mark 14:39
And again he went away, and said a prayer, using the same words.
Matthew 6:7
And in your prayer do not make use of the same words again and again, as the Gentiles do: for they have the idea that God will give attention to them because of the number of their words.
Matthew 26:42-44
Again, a second time he went away, and said in prayer, O my Father, if this may not go from me without my taking it, let your pleasure be done.
Luke 18:1
And he made a story for them, the point of which was that men were to go on making prayer and not get tired;
2 Corinthians 12:8
And about this thing I made request to the Lord three times that it might be taken away from me.