Matthew 17:17
And Jesus responding said: O, faithless and perverse generation, how long shall I be with you? bring him hither to me.
Matthew 17:20
and Jesus says to them, On account of your unbelief. For truly I say unto you, If you have faith as a grain of mustard seed, you will say to this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible to you.
Luke 1:20
And behold thou shalt be dumb and unable to speak, unto the day upon which these things may take place; because thou didst not believe my words, which shall be fulfilled in their time.
Luke 1:45
And blessed is she that believeth, because there shall be a perfection to those things having been spoken to her by the Lord.
John 1:17
Because the law was given by Moses; grace and truth came through Jesus Christ.
Romans 4:20
but he staggered not at the promise of God through unbelief; but was filled up with dynamite through faith, having given glory to God;
1 Peter 3:15
but sanctify the Lord Christ in your hearts: being always ready for an answer to every one asking you a reason for the hope which is in you, but with meekness and fear: