Muslim

Explanation:
Qadi Iyad said: Among the early generations (Salaf) — the Companions (Sahabah) and the Followers (Tabi'in) — there was great disagreement regarding the writing of knowledge. Many considered it disliked (makruh), but most deemed it permissible. Then, after that, consensus (ijma‘) was established on its permissibility and the disagreement ceased. As for the prohibition mentioned in this hadith, it is interpreted as applying to a person who possesses a strong memory but fears that by writing, he may come to rely on the written record. As for one whose memory is not strong, he is permitted to write. And the Messenger of Allah (sallallahu alayhi wa sallam) gave permission to Abu Shah to write, and of this same category is the Sahifah of our master Ali (radi Allahu anhu), the book of Amr ibn Hazm, and the book regarding charity (sadaqah) and zakat.

And our master Abu Hurairah (radi Allahu anhu) narrated that our master Abdullah ibn Amr (radi Allahu anhu) used to write, but I did not write. And some have said that this hadith is abrogated (mansukh) by those other hadiths, and that this hadith is from the time when the Prophet (sallallahu alayhi wa sallam) feared that the Qur’an and hadith might become mixed. When he was assured that this would not happen, he (sallallahu alayhi wa sallam) permitted writing. And some have said that the meaning of this hadith is that the Qur’an and my hadith should not be written together in one book, so that the reader is not confused. (Nawawi rahimahullah)

Hadith Commentary: Benefits and Issues: The prohibition against writing hadith was in effect in situations where the Qur’an and hadith were being written together, and there was a risk of mutual mixing and confusion between the two. Or, this ruling was in place at a time when the means and resources for writing were scarce, and writing both the Qur’an and hadith would cause difficulty and hardship, because writers (katib) and paper were not common. Furthermore, the prohibition against writing was also due to the fact that the Arabs had very sharp memories and would memorize everything orally, so they were instructed to memorize, so that the power of memory would not be lost due to lack of use. For this reason, the Prophet (sallallahu alayhi wa sallam) encouraged the narration of hadith, saying: “Haddithu—narrate my sayings.”