Musannaf Ibn Abi Shayba 29:81

Muhammad ibn Fudayl narrated to us, from al-A'mash, from Ibrahim, from Alqama, who said: We besieged the city of Nahavand, and I gave Mu'dad a garment of mine. He wrapped it around his head, and a stone struck his head. He began to wipe it, look at me, and say: "It is indeed small, and Allah surely blesses the small."