Mishkat al-Masabih 1 Faith كتاب الإيمان 146

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.)