Luke 11:8-10
I tell you, tho' he will not rise, to supply him, out of friendship: yet out of regard to his importunity, he will rise, and lend him whatever he has occasion for.
Luke 18:1
Jesus propos'd likewise this parable to them, to show that they should persevere in prayer, and not be discouraged.
Ephesians 6:18
Pour out your souls unto God upon all occasions, watching in prayer with all perseverance and supplication for all christians:
Colossians 4:2
Persevere and be vigilant in prayer and in thanksgiving:
1 Thessalonians 5:17
pray upon all occasions.
James 5:16
confess then to one another the offences you have committed, and pray for one another, that you may be healed; the fervent prayer of a virtuous man has great influence.