Luke 6:12
Now it came to pass in those days, that he went out into a mountain to pray and continued all night in an oratory of God.
Mark 1:35
And very early (the night being far advanced towards morning) rising up, he went forth, and retired into a desert place, and there prayed.
Matthew 6:6
But when thou prayest, enter into thy closet, and shut thy door, to pray to thy Father who is in secret; and thy Father who seeth in secret shall reward thee openly.
Matthew 14:23-25
And when he had sent away the multitude, he went up into a mountain apart to pray: and when evening came, he was there alone.
Mark 6:46
And having bid them farewell, he went into a mountain to pray.
Mark 14:34-36
and he saith to them, My soul is deeply afflicted even to death: abide here, and watch.
Colossians 4:2
Persevere in prayer, watching therein with thanksgiving;
Hebrews 5:7
who in the days of his flesh, with strong crying and tears, having offered up prayers and supplications to him who was able to save him from death, and being heard for his reverential awe,