Musannaf Ibn Abi Shaybah 35941 — Reports on fleeing from the advancing

It is narrated from Ibrahim (may Allah have mercy on him) that news reached Sayyiduna Umar (may Allah be pleased with him) that an army had become trapped in Azerbaijan, had shown patience and had all been martyred. He (may Allah be pleased with him) said: "Had they fallen back to me, I would have been their fi'ah (the party to which they could fall back)."