Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 93

وَعَنْ صُهَيْبٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «مَا آمَنَ بِالْقُرْآنِ مَنِ اسْتَحَلَّ مَحَارِمَهُ» . رَوَاهُ التِّرْمِذِيُّ وَقَالَ: هَذَا حَدِيثٌ لَيْسَ إِسْنَادُهُ بِالْقَوِيّ

Suhaib reported God’s messenger as saying, “He who treats what the Qur’ān prohibits as permissible does not believe in it.” Tirmidhī transmitted it, but said this is a tradition whose isnād is not strong.