Luke 18:1
And he told them a parable, to the effect that they ought always to pray and not lose heart.
Luke 21:36
But watch at all times, praying that you may have strength to escape all these things that will take place, and to stand before the Son of man."
Romans 12:12
Rejoice in your hope, be patient in tribulation, be constant in prayer.
Ephesians 6:18
Pray at all times in the Spirit, with all prayer and supplication. To that end keep alert with all perseverance, making supplication for all the saints,
Colossians 4:2
Continue steadfastly in prayer, being watchful in it with thanksgiving;
1 Peter 4:7
The end of all things is at hand; therefore keep sane and sober for your prayers.