Hadith 3646
Narrated Abdullah ibn Amr ibn al-As: 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.
Hadith 3905
Narrated Abdullah ibn Abbas: The Prophet ﷺ said: If anyone acquires any knowledge of astrology, he acquires a branch of magic of which he gets more as long as he continues to do so.