Abu Hilal narrated—through Qatadah—from Anas:
“ʿAbd Allah ibn Zāʾidah, who is the very same Ibn Umm Maktūm, was fighting on the day of al-Qādisiyyah, clad in his own strong, full-length coat of mail (1).
Al-Wāqidī said: He was present at al-Qādisiyyah carrying the banner, after which he returned to Medina and died there; we heard no further mention of him after the time of ʿUmar.
I say: It is also said that he was martyred at al-Qādisiyyah.
Among those who transmitted from him are ʿAbd al-Raḥmān ibn Abī Laylā—in mursal form—Abu Razīn al-Asadī, and others besides them.
Al-Qādisiyyah was a major pitched battle (2) that took place in Iraq: the Muslims were under the command of Saʿd ibn Abī Waqqāṣ, while the idolaters were led by Rustum, Dhū al-Ḥājib, and Jālinūs.
Abu Wāʾil said: The Muslims numbered more than seven thousand, whereas the enemy were forty thousand.
Others have said: sixty thousand, accompanied by seventy elephants.
Al-Madāʾinī stated: They fought for three days, at the end of Shawwāl in the year 15 AH; Rustum was killed and the enemy routed.