Rashi on Genesis 19:25/רש"י על בראשית י״ט:כ״ה

1'ויהפוך את הערים וגו AND HE OVERTHREW [THOSE CITIES] etc. — The four cities were situated on one rock and He turned them upside down, as it is said, (Job 28:9) “He putteth forth His hand upon the flinty rock [and overturneth the mountains by the roots]” (Genesis Rabbah 51:4).