Romans 12:12

Rejoicing in hope; patient in tribulation; continuing instant in prayer;

Colossians 4:2

Continue in prayer, and watch in the same with thanksgiving;

Ephesians 6:18

Praying always with all prayer and supplication in the Spirit, and watching thereunto with all perseverance and supplication for all saints;

Luke 18:1

And he spake a parable unto them {to this end}, that men ought always to pray, and not to faint;

Luke 21:36

Watch ye therefore, and pray always, that ye may be accounted worthy to escape all these things that shall come to pass, and to stand before the Son of man.

1 Peter 4:7

But the end of all things is at hand: be ye therefore sober, and watch unto prayer.