Mention of Abdullah bin Zayd bin Asim al-Mazini al-Ansari (may Allah be pleased with him)

It is narrated from Abbad bin Tamim that Sayyiduna Abdullah bin Zayd bin Asim (may Allah be pleased with him) was martyred on the day of the Battle of al-Harrah.

Muhammad bin Umar (al-Waqidi) states that the lineage of Sayyiduna Abdullah bin Zayd bin Asim (may Allah be pleased with him) goes back to Mazin bin al-Najjar. His mother was Umm Umarah Nusaybah bint Ka'b. He took part in the Battle of Uhud, the Battle of the Trench and all the campaigns alongside the Messenger of Allah (peace and blessings be upon him). He was the paternal uncle of Abbad bin Tamim. Abdullah bin Zayd was among those who killed Musaylimah the Liar on the day of the Battle of al-Yamamah. He was martyred on the day of al-Harrah, in the last days of Dhu al-Hijjah in the year 63 AH, during the rule of Yazid bin Mu'awiyah.

Abbad bin Tamim narrates from his paternal uncle Sayyiduna Abdullah bin Zayd (may Allah be pleased with him) that he had taken part in the Battle of Badr.

Ishaq bin Ibrahim al-Hanzali states that Sayyiduna Abdullah bin Zayd bin Asim (may Allah be pleased with him) was a Khazraji, belonging to Banu Mazin bin al-Najjar, and he is the one who killed Musaylimah.

Ahmad bin Zuhayr bin Harb states: I heard my father say that the kunyah of Sayyiduna Abdullah bin Zayd (may Allah be pleased with him) was Abu Muhammad.

Abbad bin Tamim states that when the time of al-Harrah came, a man came to Sayyiduna Abdullah bin Zayd (may Allah be pleased with him) and said: "This is Ibn Hanzalah taking the pledge of allegiance from people to fight until death." He replied: "After the Messenger of Allah (peace and blessings be upon him), I will not pledge allegiance to anyone on this (death)."
This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it.