20So Jesus said to them, "Because of your unbelief; for assuredly, I say to you, if you have faith as a mustard seed, you will say to this mountain, "Move from here to there,' and it will move; and nothing will be impossible for you. Matthew 17:19-20
58Now He did not do many mighty works there because of their unbelief. Matthew 13:58
6But let him ask in faith, with no doubting, for he who doubts is like a wave of the sea driven and tossed by the wind. 7For let not that man suppose that he will receive anything from the Lord; 8he is a double-minded man, unstable in all his ways. James 1:6-8
8... Nevertheless, when the Son of Man comes, will He really find faith on the earth?" Luke 18:8
6But without faith it is impossible to please Him, for he who comes to God must believe that He is [He exists], and that He is a rewarder of those who diligently seek Him. Hebrews 11:6