20. Abu Ali al-Ash’ari has narrated from al-Hassan ibn Ali al-Kufi from ‘Uthman ibn ‘Isa from Sa’id ibn Yasar from Mansur ibn Yunus from Abu ‘Abdillah عليه السلام who has said the following: “It is in the wisdom of Ale (people of) Dawud: ‘A person of reason must learn about the nature of his time, pay attention to his affairs and safeguard his tongue.’”