1؎ : The reason for this is that in the early period of Islam, the ruling was: «لا تكتبوا عني ومن كتب عني غير القرآن فليمحه وحدثوا عني ولا حرج» (Sahih Muslim), meaning: Do not write anything from me except the Qur'an, and whoever has written anything other than the Qur'an should erase it. However, there is no harm in narrating my hadiths. Later, the Prophet sallallahu alayhi wa sallam, through his statement: «بلغوا عني ولو آية», also granted permission for this.
Explanation & Benefits
Shaykh Dr. Abdur Rahman Freywai
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.
Source: Sunan al-Tirmidhi – Majlis ‘Ilmi Dar al-Da‘wah, New Delhi Edition, Page: 2665