23. Muhammad ibn al-Hasan ibn Ahmad ibn al-Walid said: Muhammad ibn al-Hasan alSaffar said: al-`Abbas ibn Ma`ruf said, on the authority of Sa`dan ibn Muslim, on the authority of Abu Basir that Abu `Abd Allah al-Sadiq said: “The only ones who quarrel in matters of faith are those who lack piety or who are assailed by doubts.”