Luke 18:1

And He spoke a parable to them that it behooves them to pray always, and not to faint;

Philippians 4:6

Be solicitous about nothing; but in all prayer and supplication, let your request be made known to God.

Colossians 4:2

Be constant in prayer, watching in the same with thanksgiving;

Treasury of Scripture Knowledge

Summary

Because he hath inclined his ear unto me, therefore will I call upon him as long as I live.

Bible References

Therefore

Luke 18:1
And He spoke a parable to them that it behooves them to pray always, and not to faint;
Philippians 4:6
Be solicitous about nothing; but in all prayer and supplication, let your request be made known to God.
Colossians 4:2
Be constant in prayer, watching in the same with thanksgiving;