30. Al-Husayn ibn Ahmad ibn Idris said, on the authority of his father, on the authority of Muhammad ibn Ahmad, on the authority of Musa ibn `Umar, on the authority of al-`Abbas ibn `Amir, on the authority of Muthanna, on the authority of Abu Baisr, that Abu `Abd Allah al-Sadiq said: “the only ones who quarrel are those who are assailed with doubts or who are devoid of piety.”