Luke 9:62
Jesus said to him, "No one who puts his hand to the plow, and then continues to look back, is fitted for service in the kingdom of God."
Acts 15:37-38
But Barnabas persisted in wanting to take along John who was called Mark.
Philippians 3:13
Brothers, I do not think that I have captured it yet, but here is my one aspiration, so forgetting what is behind me and reaching out for what is ahead of me,
Hebrews 10:38
Meantime, my righteous servant will live by faith. But if a man draws back, my soul has no delight in him."
Luke 17:31-32
The man who is on the roof of his house that day, and his goods in the house, must not come down to carry them out; and the man in the field, too, must not turn back.
2 Timothy 4:10
for Demas has forsaken me because he loved the present world, and has gone to Thessalonica; Crescens has gone to Galatia, Titus to Dalmatia;
James 1:6-8
But he must ask in faith, without a doubt, for the man who doubts is like a wave of the sea that is whirled and swayed by the wind.
2 Peter 2:20-22
For if, after men have escaped the corrupting ways of the world through a full knowledge of the Lord and Saviour Jesus Christ, they again become entangled in them and are conquered by them, then their last condition is worse than their former one.