إِيَّاكَ وَكَرَائِمَ أَمْوَالِهِمْ
Translation: Beware of taking their prized possessions.
This is part of the Prophet’s instruction to Mu‘adh concerning collection of zakat. Kara’im are exceptionally prized assets. Thus collecting middling-quality property protects fairness; the hadith does not cancel zakat liability.