Mishkat al-Masabih #227
Knowledge
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ مُعَاوِيَةَ قَالَ: إِنَّ النَّبِيَ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنِ الْأُغْلُوطَاتِ. رَوَاهُ أَبُو دَاوُد
Mu'awiya said that the Prophet forbade the discussion of thorny
questions. Abu Dawud transmitted it.
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About Mishkat al-Masabih
This hadith is #227 from Mishkat al-Masabih, in the Book of Knowledge.