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

Matthew 21:21
Jesus answered and said to them, Truly I say to you, If you have faith, and doubt not, you shall not only do this which is done to the fig tree, but also if you shall say to this mountain, Be you removed, and be you cast into the sea; it shall be done.
Torrey's Topical Textbook—AKJV

Mark 9:23
Jesus said to him, If you can believe, all things are possible to him that believes.
Torrey's Topical Textbook—AKJV