How do you figure that a prophesy need not predict the future?...

How do you figure that a prophesy need not predict the future?
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Here's an example for you.

(Judges 6:7-10) When the Israelites called to Jehovah for help because of Midʹi·an,  Jehovah sent to the Israelites a prophet who said to them: “This is what Jehovah the God of Israel says, ‘I brought you up from Egypt and thus brought you out of the house of slavery.  So I rescued you from the hand of Egypt and from all your oppressors and drove them out from before you and gave you their land. 10 And I said to you: “I am Jehovah your God. You must not fear the gods of the Amʹor·ites in whose land you are dwelling.” But you did not obey me.’”

There is no mention of the future in what this prophet said. Instead, he is sent by God to review the past. His proclamation was a prophecy because he was sent by God.