Who are “Muḥammad” and the first “Hishām” in the opening report?

Isnād as Part of Religion: Transmitter Competence, Fitnah, and Connected Transmission

• Muḥammad b. Sīrīn and Hishām b. Ḥassān
• Muḥammad b. Ismāʿīl and Hishām b. ʿUrwah
• Muḥammad b. al-Ṣabbāḥ and Hishām b. Ḥassān
• Muḥammad b. Sīrīn and Hishām b. ʿUrwah