THE DANGER OF FAITHLESSNESS AND UNBELIEF

1Ti 1:13 Who was before a blasphemer, and a persecutor, and injurious: but I obtained mercy, because I did it ignorantly in unbelief.

 Heb 3:12 Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God.

 Heb 3:19 So we see that they could not enter in because of unbelief.

 Heb 4:6 Seeing therefore it
remaineth that some must enter therein, and they to whom it was first preached entered not in because of unbelief: {it was: or, the gospel was}

 Heb 4:11 ¶ Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief. {unbelief: or, disobedience}
(KJV)

FAITHLESS
Mt 17:17 Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.

 Mr 9:19 He answereth him, and saith, O faithless generation, how long shall I be with you? how long shall I suffer you? bring him unto me.

 Lu 9:41 And Jesus answering said, O faithless and perverse generation, how long shall I be with you, and suffer you? Bring thy son hither.

 Joh 20:27 Then saith he to Thomas, Reach hither thy finger, and behold my hands; and reach hither thy hand, and thrust it into my side: and be not faithless, but believing.
(KJV)