(3) باب فِي كِتَابَةِ الْعِلْمِ
It was narrated that Abu Saeed Al-Khudri said:
"We used not to write anything but the Tasha-hud and the Qur'an."
Reference: Sunan Abi Dawud 3648
In-book reference: Book 26, Hadith 9
English translation: Book 25, Hadith 3641