New Revised Standard Version
Truly I tell you, if you say to this mountain, ‘Be taken up and thrown into the sea,’ and if you do not doubt in your heart, but believe that what you say will come to pass, it will be done for you.

Contemporary English Version
If you have faith in God and don't doubt, you can tell this mountain to get up and jump into the sea, and it will.

New American Bible
Amen, I say to you, whoever says to this mountain, ‘Be lifted up and thrown into the sea,’ and does not doubt in his heart but believes that what he says will happen, it shall be done for him.

Douay-Rheims Bible
Amen I say to you that whosoever shall say to this mountain, Be thou removed and be cast into the sea, and shall not stagger in his heart, but be believe that whatsoever he saith shall be done; it shall be done unto him.

Amen I say to you that whosoever shall say to this mountain, Be thou removed and be cast into the sea, and shall not stagger in his heart, but be believe that whatsoever he saith shall be done; it shall be done unto him.

whosoever.

Matthew 17:20 But this kind is not cast out but by prayer and fasting.

Matthew 21:21 And Jesus answering, said to them: Amen, I say to you, if you shall have faith and stagger not, not only this of the fig tree shall you do, but also if you shall say to this mountain, Take up and cast thyself into the sea, it shall be done.

Luke 17:6 And the Lord said: If you had faith like to a grain of mustard seed, you might say to this mulberry tree: Be thou rooted up and be thou transplanted into the sea. And it would obey you.

1 Corinthians 13:2 And if I should have prophecy and should know all mysteries and all knowledge, and if I should have all faith, so that I could remove mountains, and have not charity, I am nothing.

and shall.

Matthew 14:13 Which when Jesus had heard, he retired from thence by a boat, into a desert place apart, and the multitudes having heard of it, followed him on foot out of the cities.

Romans 4:18-25 Who against hope believed in hope; that he might be made the father of many nations, according to that which was said to him: So shall thy seed be. . . .

Hebrews 11:17-19 By faith Abraham, when he was tried, offered Isaac: and he that had received the promises offered up his only begotten son, . . .

James 1:5,6 But if any of you want wisdom, let him ask of God who giveth to all men abundantly and upbraideth not. And it shall be given him. . . .

whatsoever.

Psalm 37:4 Delight in the Lord, and he will give thee the requests of thy heart.

John 14:13 Because I go to the Father: and whatsoever you shall ask the Father in my name, that will I do: that the Father may be glorified in the Son.

John 15:7 If you abide in me and my words abide in you, you shall ask whatever you will: and it shall be done unto you.