23 “TrulyaI tell you, if anyone says to this mountain, ‘Go, throw yourself into the sea,’ and does not doubt in their heart but believes that what they say will happen, it will be done for them.

Read Mark 11:23 Using Other Translations

For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.
Truly, I say to you, whoever says to this mountain, 'Be taken up and thrown into the sea,' and does not doubt in his heart, but believes that what he says will come to pass, it will be done for him.
I tell you the truth, you can say to this mountain, ‘May you be lifted up and thrown into the sea,’ and it will happen. But you must really believe it will happen and have no doubt in your heart.