John 13:19

19 I tell you this now, before it occurs, so that when it does occur, you may believe that I am he.

John 13:19 In-Context

17 If you know these things, you are blessed if you do them.
18 I am not speaking of all of you; I know whom I have chosen. But it is to fulfill the scripture, "The one who ate my bread has lifted his heel against me.'
19 I tell you this now, before it occurs, so that when it does occur, you may believe that I am he.
20 Very truly, I tell you, whoever receives one whom I send receives me; and whoever receives me receives him who sent me."
21 After saying this Jesus was troubled in spirit, and declared, "Very truly, I tell you, one of you will betray me."

Footnotes 1

New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.