וּבְבֹאָ֑הּ הִנֵּ֣ה בָאָ֔ה וְיָ֣דְע֔וּ כִּ֥י נָבִ֖יא הָיָ֥ה בְתוֹכָֽם׃ (ס)
אָבער װען עס קומט – זע, עס קומט –װעלן זײ װיסן אַז אַ נבֿיא איז געװען צװישן זײ.
Rashi
behold it is coming for, indeed, it is ready to come; then they will know that your words were not a jest, but that a true prophet was in their midst.