Matthew 13:21
"But he has no root in himself; he continues for a time, but when trouble arises, or persecutions, on account of the word, at once he stumbles and falls.
Luke 18:1
He also taught them by a parable how they ought always to pray and never to lose heart.
Acts 10:2
He was a devout man and God-fearing, and so were all his household. He gave many alms to the people, and constantly prayed to God.
Ephesians 6:18
Continue to pray at all times, with all prayer and supplication in the Spirit, and watching for it with all perseverance and supplication for all saints;
1 Thessalonians 5:17
Pray without ceasing.