The greatest sinner of the Muslims amongst Muslims is one who asked about a certain thing which had not been prohibited and it was prohibited because of his asking about it.
أَحْفَظُهُ كَمَا أَحْفَظُ بِسْمِ اللَّهِ الرَّحْمَنِ الرَّحِيمِ الزُّهْرِيُّ عَنْ عَامِرِ بْنِ سَعْدٍ عَنْ أَبِيهِ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ أَعْظَمُ الْمُسْلِمِينَ فِي الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ أَمْرٍ لَمْ يُحَرَّمْ فَحُرِّمَ عَلَى النَّاسِ مِنْ أَجْلِ مَسْأَلَتِهِ
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.
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ أَعْظَمَ الْمُسْلِمِينَ فِي الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ أَمْرٍ لَمْ يُحَرَّمْ فَحُرِّمَ عَلَى النَّاسِ مِنْ أَجْلِ مَسْأَلَتِهِ
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. (Using translation from Abū Dāʾūd 4610)
النَّبِيَّ ﷺ أَعْظَمُ الْمُسْلِمِينَ فِي الْمُسْلِمِينَ جُرْمًامَنْ سَأَلَ عَنْ أمْرٍ لَمْ يُحَرَّمْ فَحُرِّمَ عَلَى النَّاسِ مِنْ أَجْلِ مَسْأَلَتِهِ