Hebrews 10:39

But we are not of those who draw back, unto perdition; but of those who believe, to the saving of the soul.

Luke 17:31-32

In that day, let not him who is upon the housetop, and whose furniture is in the house, come down to take it away; and he that is in the field, let him likewise not turn back.

Acts 15:38

But Paul did not think it proper to take with them a man who had left them in Pamphylia, and went not with them to the work.

2 Timothy 4:10

For Demas forsook me, because he loved the present world, and went to Thessalonica; Crescens to Galatia, Titus to Dalmatia.

Treasury of Scripture Knowledge

Summary

Because they turned back from him, and would not consider any of his ways:

Bible References

Turned

Luke 17:31
In that day, let not him who is upon the housetop, and whose furniture is in the house, come down to take it away; and he that is in the field, let him likewise not turn back.
Acts 15:38
But Paul did not think it proper to take with them a man who had left them in Pamphylia, and went not with them to the work.
2 Timothy 4:10
For Demas forsook me, because he loved the present world, and went to Thessalonica; Crescens to Galatia, Titus to Dalmatia.
Hebrews 10:39
But we are not of those who draw back, unto perdition; but of those who believe, to the saving of the soul.