GOD'S WORD® Translation
I'm telling you now before it happens. Then, when it happens, you will believe that I am the one.

American Standard Version
From henceforth I tell you before it come to pass, that, when it is come to pass, ye may believe that I am he .

Berean Study Bible
I am telling you now before it happens, so that when it comes to pass, you will believe that I am He.

Douay-Rheims Bible
At present I tell you, before it come to pass: that when it shall come to pass, you may believe that I am he.

English Revised Version
From henceforth I tell you before it come to pass, that, when it is come to pass, ye may believe that I am he.

King James Bible
Now I tell you before it come, that, when it is come to pass, ye may believe that I am he.

World English Bible
From now on, I tell you before it happens, that when it happens, you may believe that I am he.

Young's Literal Translation
From this time I tell you, before its coming to pass, that, when it may come to pass, ye may believe that I am he;

John 13:19 Additional Translations ...