1-22 Muhammad ibn Musa ibn al-Mutevakil - may God be pleased with him - narrated that Ali ibn al-Hussein al-Sa’ed Abady quoted on the authority of Ahmad ibn Muhammad ibn Khalid, on the authority of his father, on the authority of Yunus ibn Abdul-Rahman, on the authority of Davood ibn Farqad that Abu Abdullah as-Sadiq (MGB) on the authority of said, “Anger is the key to all evil.”