Matthew 17:17
Then Jesus answered and said, O unbelieving and perverse generation, how long shall I be with you? how long shall I bear with you?
Matthew 17:20
And Jesus said unto them, because of your unbelief: for verily I tell you, if ye had but faith as a grain of mustard-seed, ye might say to this mountain, Remove from hence thither, and it shall remove: and nothing would be impossible to you.
Mark 8:17-18
And Jesus knowing it saith unto them, What are ye reasoning about? because ye have no bread? Do ye not yet discern nor understand? have ye your heart still hardened?
Hebrews 12:5
Have ye forgotten the exhortation, which speaketh to you as to sons, saying, "My son, despise not the chastening of the Lord, nor saint when rebuked by Him?