Luke 6:12

Now it was in those days that He went up on the mountain to pray, and He spent the whole night in prayer to God.

Mark 1:35

Early in the morning, long before daybreak, He got up and went out to a lonely spot, and stayed praying there.

Matthew 6:6

But whenever you, follower of mine, pray, you must go to your most private place, shut the door, and pray to your Father in secret, and your Father who sees what is secret will reward you.

Matthew 14:23-25

After He had dismissed the crowds, He went up the hill alone to pray. And after the evening came on, He was there alone,

Mark 6:46

After He had told them "Goodbye," He went up the hill to pray.

Mark 14:34-36

and so He said to them, "My heart is breaking, it almost kills me! You must stay here and keep watching."

Colossians 4:2

You must persevere in prayer and by this means stay wide awake when you give thanks.

Hebrews 5:7

For during His human life He offered up prayers and entreaties, crying aloud with tears to Him who was always able to save Him out of death, and because of His beautiful spirit of worship His prayer was heard.

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 He had dismissed the crowds, He went up the hill alone to pray. And after the evening came on, He was there alone,
Mark 6:46
After He had told them "Goodbye," He went up the hill to pray.
Colossians 4:2
You must persevere in prayer and by this means stay wide awake when you give thanks.

General references

Mark 1:35
Early in the morning, long before daybreak, He got up and went out to a lonely spot, and stayed praying there.
Mark 3:13
Then He went up on the hillside and summoned to Him those whom He wanted, and they went to Him.
Mark 6:46
After He had told them "Goodbye," He went up the hill to pray.
Luke 5:16
But Jesus Himself continued His habit of retiring to lonely spots and praying.
John 6:3
And so Jesus went up on the hill and was sitting there with His disciples.