Luke 18:1
He also taught them by a parable that they must always pray and never lose heart.
Luke 18:7
And will not God avenge the wrongs of His own People who cry aloud to Him day and night, although He seems slow in taking action on their behalf?
Ephesians 6:18
Pray with unceasing prayer and entreaty on every fitting occasion in the Spirit, and be always on the alert to seize opportunities for doing so, with unwearied persistence and entreaty on behalf of all God's people,
Hebrews 10:36-37
For you stand in need of patient endurance, so that, as the result of having done the will of God, you may receive the promised blessing.