Hazrat Yusuf bin Mahak narrates that Hazrat Abdullah bin Amr (may Allah be pleased with him) said: I used to write down every hadith that I heard from the Messenger of Allah (peace and blessings be upon him) so that I could remember it. The Quraysh stopped me from doing so and said, "Do you write down everything that the Messenger of Allah (peace and blessings be upon him) says? Whereas the Messenger of Allah (peace and blessings be upon him) sometimes speaks in a state of happiness and sometimes in a state of anger!" He says: I stopped writing and mentioned this to the Noble Prophet (peace and blessings be upon him). So he (peace and blessings be upon him) pointed to his tongue and said: Write! By the One in whose hand is my soul, nothing comes out from this tongue except the truth.