before it happens
Isaiah 46:9 (WEB) Remember the former things of old:
for I am God, and there is no other.
I am God, and there is none like me.
10 I declare the end from the beginning,
and from ancient times things that are not yet done.
I say: My counsel will stand,
and I will do all that I please.
John 13:19 From now on, I tell you before it happens, that when it happens, you may believe that I am he.