Luke 11:8-10
I tell you, tho' he will not rise and give him, because he is his friend: yet because of his importunity he will rise and give him as many as he wants.
Luke 18:1
And He spake also a parable to them, to shew that men ought always to pray, and not to faint:
Ephesians 6:18
praying at all seasons with all prayer and supplication in the Spirit, and watching thereunto with all perseverance, and intercession for all the saints;
Colossians 4:2
Persevere in prayer, and be watchful in it, with thanksgiving.
1 Thessalonians 5:17
Pray continually.
James 5:16
Confess your faults one to another, and pray for one another, that ye may be healed: the fervent prayer of a righteous man availeth much.