2813 – Muhammad ibn al-Husayn ibn Yaʿqub related to us; he said: Dalaj ibn Ahmad al-Sijistani narrated to us; he said: Ahmad ibn ʿAli narrated to us; he said: Abu Ghassan—that is, Muhammad ibn ʿAmr—narrated to us; he said: Ibrahim ibn al-Mughira, an elder who had performed the pilgrimage many times, said: “I asked al-Thawri, ‘May one pray behind a man who reviles Abu Bakr and ʿUmar?’ He replied, ‘No.’”