Matthew 13:21
but having no root in him he has only an occasional faith: for as soon as any oppression or persecution arises upon account of the gospel, he presently relapses.
Luke 18:1
Jesus propos'd likewise this parable to them, to show that they should persevere in prayer, and not be discouraged.
Acts 10:2
and was a proselyte, together with all his family: he gave much alms to the people, and was assiduous in his prayers to God.
Ephesians 6:18
Pour out your souls unto God upon all occasions, watching in prayer with all perseverance and supplication for all christians:
1 Thessalonians 5:17
pray upon all occasions.