1 Samuel 1:12
And it came to pass as she continued praying before the LORD that Eli was observing her mouth.
Luke 11:8-10
I say unto you, Though 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 needs.
Luke 18:1
And he spoke a parable unto them to this end, that it behooves us always to pray and not faint,
Ephesians 6:18
praying always with all prayer and supplication in the Spirit and watching in this with all perseverance and supplication for all the saints
Colossians 4:2
Persevere in prayer and watch in the same with thanksgiving,
1 Thessalonians 5:17
Pray without ceasing.
James 5:16
Confess your faults one to another and pray one for another that ye may be whole. The effectual prayer of the righteous is very powerful.