New King James Version
Jesus said to him, “If you can believe, all things are possible to him who believes.”

King James Bible
Jesus said unto him, If thou canst believe, all things are possible to him that believeth.

American Standard Version
And Jesus said unto him, If thou canst! All things are possible to him that believeth.

Berean Study Bible
“If You can?” echoed Jesus. “All things are possible to him who believes!”

Douay-Rheims Bible
And Jesus saith to him: If thou canst believe, all things are possible to him that believeth.

English Revised Version
And Jesus said unto him, If thou canst! All things are possible to him that believeth.

World English Bible
Jesus said to him, "If you can believe, all things are possible to him who believes."

Young's Literal Translation
And Jesus said to him, 'If thou art able to believe! all things are possible to the one that is believing;'

Mark 9:23 Additional Translations ...