Luke 6:12
And it happened during that time that Jesus went out to the mountain [i.e., probably a hillside near Capernaum] to pray, and continued praying to God all night.
Mark 1:35
Very early in the morning, [even] before daylight, Jesus woke up, left Simon's house [verse 29] and went out to a deserted place where He prayed.
Matthew 6:6
But when you pray, go to a private place and after closing the door, pray to your Father who is in a secret place, and [since] He sees in secret places, He will reward you.
Matthew 14:23-25
After He had dispersed them, He went up into the mountain by Himself to pray. When evening had come He was there alone.
Mark 6:46
And after He had left them He went into a mountain to pray.
Mark 14:34-36
He said to them, "My soul is extremely grieved, even to the point where I could die. Stay here and be alert [i.e., in prayer]."
Colossians 4:2
Continue to pray regularly; stay alert and be thankful.
Hebrews 5:7
During His life on earth Jesus offered up prayers and special requests with loud crying and tears to God, who was able to save Him from dying, and He was heard because of His [earnest] devotion [to God].