Canaan Saw and Told So the Fault Was Hung on Him
Yalkut Shimoni on Torah 61:12
Rabbi Nechemiah says: Canaan saw and told; therefore one hangs the fault upon the faulty one.
רַבִּי נְחֶמְיָה אוֹמֵר כְּנַעַן רָאָה וְהִגִּיד לְפִיכָךְ תּוֹלִין הַקַּלְקָלָה בַּמְּקוּלְקָל.