Luke 6:12

Now about that time, Jesus went out, up the hill, to pray, and spent the whole night in prayer to God.

Mark 1:35

In the morning, long before daylight, Jesus rose and went out, and, going to a lonely spot, there began to pray.

Matthew 6:6

But, when one of you prays, let him go into his own room, shut the door, and pray to his Father who dwells in secret; and his Father, who sees what is secret, will recompense him.

Matthew 14:23-25

After dismissing the crowds, he went up the hill by himself to pray; and, when evening fell, he was there alone.

Mark 6:46

After he had taken leave of the people, he went away up the hill to pray.

Mark 14:34-36

"I am sad at heart," he said, "sad even to death; wait here, and watch."

Colossians 4:2

Devote yourselves to prayer. Give your whole mind to it, and also offer thanksgiving;

Hebrews 5:7

Jesus, in the days of his earthly life, offered prayers and supplications, with earnest cries and with tears, to him who was able to save him from death; and he was heard because of his devout submission.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Continued

Matthew 14:23
After dismissing the crowds, he went up the hill by himself to pray; and, when evening fell, he was there alone.
Mark 6:46
After he had taken leave of the people, he went away up the hill to pray.
Colossians 4:2
Devote yourselves to prayer. Give your whole mind to it, and also offer thanksgiving;

General references

Mark 1:35
In the morning, long before daylight, Jesus rose and went out, and, going to a lonely spot, there began to pray.
Mark 3:13
And Jesus made his way up the hill, and called those whom he wished; and they went to him.
Mark 6:46
After he had taken leave of the people, he went away up the hill to pray.
Luke 5:16
But Jesus used to withdraw to lonely places and pray.
John 6:3
Jesus went up the hill, and sat down there with his disciples.