John 13:19

19 I'm telling you now, before it happens; so that when it does happen, you may believe that I AM [who I say I am].

John 13:19 In-Context

17 If you know these things, you will be blessed if you do them.
18 "I'm not talking to all of you -- I know which ones I have chosen. But the words of the Tanakh must be fulfilled that say, `The one eating my bread has turned against me.'
19 I'm telling you now, before it happens; so that when it does happen, you may believe that I AM [who I say I am].
20 Yes, indeed! I tell you that a person who receives someone I send receives me, and that anyone who receives me receives the One who sent me."
21 After saying this, Yeshua, in deep anguish of spirit, declared, "Yes, indeed! I tell you that one of you will betray me."
Complete Jewish Bible Copyright 1998 by David H. Stern. Published by Jewish New Testament Publications, Inc. All rights reserved. Used by permission.