Luke 18:1
And he spoke a parable to them to show that they ought to pray always, and not be fainthearted:
Colossians 4:2
Persevere in prayer, being watchful therein with thanksgiving;
Romans 12:12
Rejoice in hope; be patient in affliction; persevere in prayer.
Ephesians 6:18
praying with all prayer and entreaty at all times in the Spirit; and watching to this end with all perseverance and entreaty for all the saints,
1 Thessalonians 5:17
Pray without ceasing;
Philippians 4:6
Be anxious about nothing, but in everything by prayer and supplication with thanksgiving let your requests be made known to God;
Luke 21:36
But watch at all times, and pray that ye may be able to escape all the things that are about to come to pass, and to stand before the Son of man.
Luke 11:5-9
And he said to them, Which of you shall have a friend, and shall go to him at midnight, and say to him Friend, lend me three loaves;
2 Corinthians 4:1
Therefore, having this ministry through the mercy we received, we are not fainthearted;
Galatians 6:9
And let us not be fainthearted in welldoing; for in due season we shall reap, if we faint not.
Colossians 4:12
Epaphras, who is one of you, a servant of Christ Jesus, saluteth you, always striving for you in his prayers, that ye may stand perfect and fully assured in all the will of God.
Hebrews 12:3-5
For consider him that endured such contradiction by sinners against him, lest ye faint in your souls, and become weary.