Mattityahu 17:20-21

Orthodox Jewish Bible

²⁰ And Rebbe, Melech HaMoshiach said to them, On account of your little emunah, for, omein, I say to you, if you have emunah as a mustard seed, you shall say to this mountain, Move from here, and it shall be moved; and nothing shall be impossible for you.

²¹ But this kind [i.e., kind of mazikim (malicious spirits)] do not come out except by tefillah and tzom.