Matthew 13:21
but it takes no real root in him, and he lasts only a little while, and just as soon as suffering and persecution come for the truth's sake, he at once yields and falls.
Luke 18:1
Now He told them the following story to show how necessary it is for people always to pray and never to give up:
Acts 10:2
a religious man, too, who revered God with all his household, who was always liberal in his many deeds of charity to the people, and who had the habit of praying to God.
Ephesians 6:18
Keep on praying in the Spirit, with every kind of prayer and entreaty, at every opportunity, be ever on the alert with perfect devotion and entreaty for all God's people,
1 Thessalonians 5:17
Never stop praying.