Tirmidhi

Explanation:
1:
The reason for this is that, in the early period of Islam, the ruling was: “Do not write anything from me, and whoever has written anything from me other than the Qur’an, let him erase it. And narrate from me, and there is no harm.” (Sahih Muslim) That is, do not write anything of mine except the Qur’an, and if anyone has written anything other than the Qur’an, let him erase it. However, there is no harm in narrating my hadiths. Later, the Prophet (sallallahu alayhi wa sallam), through his statement: “Convey from me, even if it is a single verse,” granted permission for this as well.