וְהִנֵּ֖ה נָפַ֣ל הַקִּ֑יר הֲלוֹא֙ יֵאָמֵ֣ר אֲלֵיכֶ֔ם אַיֵּ֥ה הַטִּ֖יחַ אֲשֶׁ֥ר טַחְתֶּֽם׃ (ס)
and, lo, when the wall is fallen, shall it not be said unto you: Where is the daubing wherewith ye have daubed it?
Read midrashic interpretation of Ezekiel 13:12: and classical rabbinic exegesis.