Luke 11:8-10
I tell you, though even he would not rise and give him because he is his friend; yet because of his importunity, roused up, he will give him as many as he needeth.
Luke 18:1
THEN he spake also to them a parable, to shew that we ought to pray always, and not faint;
Ephesians 6:18
praying at every opportunity with all prayer and supplication in Spirit, and watching for this very purpose with perseverance and intercession for all the saints;
Colossians 4:2
Persevere in prayer, watching therein with thanksgiving;
1 Thessalonians 5:17
Pray without ceasing.
James 5:16
Confess your offences one to another, and pray for one another, that ye may be healed. The energetic prayer of a righteous man is mightily prevalent.