"We sought permission from the Messenger of Allah (ﷺ) for writing but he did not permit us."
Jami` at-Tirmidhi Book 41, Hadith 21
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that the Messenger of Allah (ﷺ) said: "Lo! Soon a Hadith from me will be conveyed to a man, while he is reclining on his couch, and he says: 'Between us and you is Allah's Book. So whatever we find in it that is lawful, we consider lawful, and whatever we find in it that is unlawful, we consider it unlawful.' Indeed whatever the Messenger of Allah (ﷺ) made unlawful, it is the same as what Allah made unlawful."
Jami` at-Tirmidhi Book 41, Hadith 20 Next Hadith → "There was a man among the Ansar who would sit with the Messenger of Allah (ﷺ), and he would listen to the Ahadith of the Prophet (ﷺ) and he was amazed with them but he could not remember them. So he complained about that to the Messenger of Allah (ﷺ). He said: 'O Messenger of Allah! I listen to your Ahadith and I am amazed but I can not remember them.' So the Messenger of Allah (ﷺ) said: 'Help yourself with your right hand' and he motioned with his hand as if writing.'"
Jami` at-Tirmidhi Book 41, Hadith 22
Jami` at-Tirmidhi Book 41, Hadith 20 Next Hadith → "There was a man among the Ansar who would sit with the Messenger of Allah (ﷺ), and he would listen to the Ahadith of the Prophet (ﷺ) and he was amazed with them but he could not remember them. So he complained about that to the Messenger of Allah (ﷺ). He said: 'O Messenger of Allah! I listen to your Ahadith and I am amazed but I can not remember them.' So the Messenger of Allah (ﷺ) said: 'Help yourself with your right hand' and he motioned with his hand as if writing.'"
Jami` at-Tirmidhi Book 41, Hadith 22