Bulugh al-Maram 77
Narrated ‘Abdullah bin Abu Bakr (rad):
The book written by Allah’s Messenger (ﷺ) for ‘Amr bin Hazm also contained: “ None except a pure person should touch the Quran”. [Reported by Malik as a Mursal and by An-Nasa’i and Ibn Hibban as Mawsul. And it is graded as Ma’lul (defective)].
وَعَنْ عَبْدِ اَللَّهِ بْنِ أَبِي بَكْرٍ رَحِمَهُ اَللَّهُ; { أَنَّ فِي اَلْكِتَابِ اَلَّذِي كَتَبَهُ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-لِعَمْرِو بْنِ حَزْمٍ: أَنْ لَا يَمَسَّ اَلْقُرْآنَ إِلَّا طَاهِرٌ }  رَوَاهُ مَالِكٌ مُرْسَلاً, وَوَصَلَهُ النَّسَائِيُّ, وَابْنُ حِبَّانَ, وَهُوَ مَعْلُولٌ.‏