Matthew 17:20
And Jesus said to them, Because of your unbelief: for truly I say to you, If you have faith as a grain of mustard seed, you shall say to this mountain, Remove hence to yonder place; and it shall remove; and nothing shall be impossible to you.
Torrey's Topical Textbook—AKJV

Mark 6:5
And he could there do no mighty work, save that he laid his hands on a few sick folk, and healed them.
Torrey's Topical Textbook—AKJV