al-Ḥakam b. Mūsá > Yaḥyá b. Ḥamzah > Sulaymān b. Dāwud al-Khawlānī > al-Zuhrī > Abū Bakr b. Muḥammad b. ʿAmr b. Ḥazm from his father from his grandfather

The Messenger of Allah, peace be upon him, wrote with Amr ibn Hazm to Shurahbil ibn Abd Kulal, Harith ibn Abd Kulal, and Nuaim ibn Abd Kulal, that in every five ounces of paper there are five dirhams. And whatever exceeds that, in every forty dirhams there is one dirham, and there is nothing less than five ounces. – Weak Chain

أَخْبَرَنَا الْحَكَمُ بْنُ مُوسَى حَدَّثَنَا يَحْيَى بْنُ حَمْزَةَ عَنْ سُلَيْمَانَ بْنِ دَاوُدَ الْخَوْلَانِيِّ حَدَّثَنِي الزُّهْرِيُّ عَنْ أَبِي بَكْرِ بْنِ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَزْمٍ عَنْ أَبِيهِ عَنْ جَدِّهِ

أَنَّ رَسُولَ اللَّهِ ﷺ كَتَبَ مَعَ عَمْرِو بْنِ حَزْمٍ إِلَى شُرَحْبِيلَ بْنِ عَبْدِ كُلَالٍ وَالْحَارِثِ بْنِ عَبْدِ كُلَالٍ وَنُعَيْمِ بْنِ عَبْدِ كُلَالٍ إِنَّ فِي كُلِّ خَمْسِ أَوَاقٍ مِنَ الْوَرِقِ خَمْسَةَ دَرَاهِمَ فَمَا زَادَ فَفِي كُلِّ أَرْبَعِينَ دِرْهَمًا دِرْهَمٌ وَلَيْسَ فِيمَا دُونَ خَمْسِ أَوَاقٍ شَيْءٌ – إسناده ضعيف