Matthew 13:58 And he did not many mighty works there because of their unbelief.

Matthew 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.

Matthew 17:20 And Jesus said unto them, Because of your unbelief: for verily I say unto you, If ye have faith as a grain of mustard seed, ye shall say unto this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible unto you.

Mark 9:23 Jesus said unto him, If thou canst believe, all things are possible to him that believeth.

Genesis 19:22 Haste thee, escape thither; for I cannot do any thing till thou be come thither. Therefore the name of the city was called Zoar.

Isaiah 59:1 Behold, the LORD's hand is not shortened, that it cannot save; neither his ear heavy, that it cannot hear:

Isaiah 59:2 But your iniquities have separated between you and your God, and your sins have hid his face from you, that he will not hear.

Hebrews 4:2 For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.

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