1 Samuel 1:12
Now while she was a long time in prayer before the Lord, Eli was watching her mouth.
Luke 11:8-10
I say to you, Though he will not get up and give to him, because he is his friend, still, if he keeps on making his request, he will get up and give him as much as he has need of.
Luke 18:1
And he made a story for them, the point of which was that men were to go on making prayer and not get tired;
Ephesians 6:18
With prayers and deep desires, making requests at all times in the Spirit, and keeping watch, with strong purpose, in prayer for all the saints,
Colossians 4:2
Give yourselves to prayer at all times, keeping watch with praise;
1 Thessalonians 5:17
Keep on with your prayers.
James 5:16
So then, make a statement of your sins to one another, and say prayers for one another so that you may be made well. The prayer of a good man is full of power in its working.