Doubters Beware!
Hebrews 3:6
But Christ as a son over his own house; whose house are we, if we hold fast the confidence and the rejoicing of the hope firm unto the end.
Hebrews 3:12
Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.
Hebrews 3:14
For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end;
Colossians 1:21-23
And you, that were sometime alienated and enemies in [your] mind by wicked works, yet now hath he reconciled
In the body of his flesh through death, to present you holy and unblameable and unreproveable in his sight:
If ye continue in the faith grounded and settled, and [be] not moved away from the hope of the gospel, which ye have heard, [and] which was preached to every creature which is under heaven; whereof I Paul am made a minister;
Hebrews 10:39
But we are not of them who draw back unto perdition; but of them that believe to the saving of the soul.

