Mishkat al-Masabih #146
Faith
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ سَعْدِ بْنِ أَبِي وَقَّاصٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «أَن أعظم الْمُسلمين فِي لامسلمين جُرْمًا مَنْ سَأَلَ عَنْ شَيْءٍ لَمْ يُحَرَّمْ على النَّاس فَحرم من أجل مَسْأَلته»
Sa'd b. Abu Waqqas reported God’s messenger as saying, “The Muslim who offends most against the Muslims is he who enquires about something which has not been forbidden to men, and it is declared forbidden because of his enquiry.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #146 from Mishkat al-Masabih, in the Book of Faith.