Luke 18:7
So, will God not grant justice to His elect [i.e., His people] who call out to Him [i.e., in prayer] day and night? Will He be slow in helping them?
Matthew 26:44
He left and went away from them again and prayed a third time, saying the same words again.
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.
Luke 22:41-46
Then Jesus went away from them about the distance of a stone's throw and knelt down and prayed,
1 Thessalonians 3:10
Night and day we pray very earnestly that we will be able to see you in person, so we can provide what is lacking in your faith.
2 Timothy 1:3
I thank God, whom I worship [or, "serve"] with a clear conscience, as my forefathers did, that I can remember you [i.e., your commitment] continually in my prayers night and day.