וְל֤וֹא הָֽיְתָה֙ סְדֹ֣ם אֲחוֹתֵ֔ךְ לִשְׁמוּעָ֖ה בְּפִ֑יךְ בְּי֖וֹם גְּאוֹנָֽיִךְ׃
For thy sister Sodom was not mentioned by thy mouth in the day of thy pride;
Rashi on Ezekiel
Now, was not Sodom your sister, etc. This is a [rhetorical] question.
Rashi on Ezekiel
a report in your mouth [by which] to reprove many and to say, Beware that you should not be overturned like Sodom, as though it were recent news to you.
Rashi on Ezekiel
on the day of your pride When you were in your greatness.