Rashi on Genesis 18:25/רש"י על בראשית י״ח:כ״ה

1חלילה לך FAR BE IT FROM THEE — It is a profanation (חולין) of Yourself. People will say, “That is what He usually busies Himself with: He destroys every one, righteous and wicked alike” —and thus did You indeed do to the generation of the Flood and to that of the dispersal of nations (Midrash Tanchuma, Vayera 8).

2כדבר הזה ANYTHING LIKE THIS THING — neither this nor anything like it (Genesis Rabbah 49:10).

3חלילה לך IT IS UNWORTHY OF THEE —in the world to come.

4השופט כל הארץ SHALL NOT THE JUDGE OF ALL THE EARTH [DO JUSTICE]? — The 'ה of השופט is punctuated with Chataph Patach because the words express a question: “Should not He who is Judge practice true justice”?