The greatest sinner amongst the Muslims is one who asked about a thing (from Allah's Apostle) which had not been forbidden for the Muslims and it was forbidden for them because of his persistently asking about it.
قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ أَعْظَمَ الْمُسْلِمِينَ فِي الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ شَىْءٍ لَمْ يُحَرَّمْ عَلَى الْمُسْلِمِينَ فَحُرِّمَ عَلَيْهِمْ مِنْ أَجْلِ مَسْأَلَتِهِ
The Prophet ﷺ said, "The most sinful person among the Muslims is the one who asked about something which had not been prohibited, but was prohibited because of his asking."
أَنَّ النَّبِيَّ ﷺ قَالَ إِنَّ أَعْظَمَ الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ شَىْءٍ لَمْ يُحَرَّمْ فَحُرِّمَ 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
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)
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «إِنَّ أَعْظَمَ النَّاسِ فِي الْمُسْلِمِينَ جُرْمًا مَنْ سَأَلَ عَنْ مَسْأَلَةٍ لَمْ تُحَرَّمْ فَحُرِّمَ عَلَى الْمُسْلِمِينَ مِنْ أَجْلِ مَسْأَلَتِهِ»
"إِنَّ أَعْظَمَ الْمُسلِمِينَ في الْمُسلِمِينَ جُرمًا من سَأَلَ عَنْ شَىْءٍ لَمْ يُحرَّمْ علَى المُسلمِين فَحُرِّمَ عليهم من أَجلِ مَسْألَتِه".