Hadith #3646 (Sunan Abi Dawud)
Book: Knowledge (Kitab Al-Ilm)
Narrator(s): al-Muttalib bin 'Abdullah bin Hantab المطلب بن عبد الله بن حنطب, Kathir bin Zayd al-'Aslmy كثير بن زيد الأسلمي, Muhammad bin 'Abdullah bin al-Zubair محمد بن عبد الله أبو أحمد الزبيري, Nasr bin 'Ali bin Nasr bin 'Ali
Grade: Sahih

I used to write everything which I heard from the Messenger of Allah (ﷺ). I intended (by it) to memorise it. The Quraysh prohibited me saying: Do you write everything  that you hear from him while the Messenger of Allah (ﷺ) is a human being: he speaks in anger and pleasure? So I stopped writing, and mentioned it to the Messenger of Allah (ﷺ). He signalled with his finger to him mouth and said: Write, by Him in Whose hand my soul lies, only right comes out from it.

Source: https://parallelquran.com/hadith/sunan-abi-dawud-3646/