تَأْمُرُ بِالْعُرْفِ وَتَنْتَهِكُ حِمَاهُ
You command what is right while violating its protected bounds yourself.
Al-ʿurf means recognized right or goodness. Ḥimāh is a protected domain; tantahiku means to violate its sanctity or boundary.
The sermon now moves from misplaced preferences to overt inconsistency: demanding a standard of others while disregarding it personally.