Sunan Abī Dāwūd Ḥadīth [3646] – The Writing of Knowledge
It is narrated on the authority of ‘Abdullāh ibn ‘Amr ibn al-‘Āṣ (may Allāh be pleased with them both) that he said: I used to write everything which I heard from the Messenger of Allāh (peace and blessings of Allāh be upon him). I intended (by it) to memorize it. The Quraysh prohibited me saying: Do you write everything that you hear from him while the Messenger of Allāh (peace and blessings of Allāh be upon him) is a human being: He speaks in anger and pleasure? So I stopped writing, and mentioned it to the Messenger of Allāh (peace and blessings of Allāh be upon him). He signaled with his finger to his mouth and said: “Write! by Him in Whose hand my soul lies, nothing comes from it except the truth.”