Ezekiel 33:33
And when this cometh to pass, (lo, it will come,) then shall they know that a prophet hath been among them.
Cross-reference
In Ezekiel 2:5, the same phrase 'they will know that a prophet has been among them' appears, reinforcing the prophet's validation through fulfilled prophecy.
1 Samuel 3:20 shows all Israel recognizing Samuel as a prophet—fulfillment brings recognition, just as in Ezekiel 33:33.
Jeremiah 28:9 states that a true prophet is known when his prophecy comes to pass—exactly the same test as in Ezekiel 33:33.
In Zechariah 2:11, 'you shall know that the LORD of hosts has sent me' closely parallels the prophet's validation, as both stress recognition of the divine messenger.
Malachi 2:4 says 'you shall know that I have sent this command,' using a similar recognition formula for the covenant, echoing the prophet's authentication.