Luke 6:12
"And it came to pass in those days, that he went out into a mountain to pray, and continued all night in prayer to God."
Cross References (ranked by relevance)
Who in the days of his flesh, when he had offered up prayers and supplications with strong crying and tears unto him that was able to save him from death, and was heard in that he feared;
And when he had sent them away, he departed into a mountain to pray.
And in the morning, rising up a great while before day, he went out, and departed into a solitary place, and there prayed.
But thou, when thou prayest, enter into thy closet, and when thou hast shut thy door, pray to thy Father which is in secret; and thy Father which seeth in secret shall reward thee openly.
Continue in prayer, and watch in the same with thanksgiving;
Now when Daniel knew that the writing was signed, he went into his house; and his windows being open in his chamber toward Jerusalem, he kneeled upon his knees three times a day, and prayed, and gave thanks before his God, as he did aforetime.
O my God, I cry in the day time, but thou hearest not; and in the night season, and am not silent.