Hadith 1:146
Muttafaqun 'alayh (Zubair `Aliza'i)
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.)
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»
Original Reference: Mishkat al-Masabih 153