Flag-Bearer at the Battle of Badr & Uhud
Hazrat Mus‘ab (ra) bin Umair participated in the Battles of Badr and Uhud. During the Battles of Badr and Uhud, the main flag of the Muhajireen was being carried by Hazrat Mus‘ab (ra) bin Umair. During the Battle of Badr, the main flag of the Muhajireen was given to him by the Holy Prophet (sa).
(al-Tabaqaat-ul-Kubra li ibn Sa‘d, Vol. 3, p. 89, Mus’ab (ra) bin Umair, Dar-ul-Kutub al-Ilmiyyah, Beirut [1990])
Then, there is another similar narration, which has been recorded in Sirat Khatamun-Nabiyyin by Hazrat Mirza Bashir Ahamd Sahib (ra) in which it also states that during the Battle of Uhud, the flag of the Muhajireen was held by Hazrat Mus‘ab (ra) bin Umair. It further states:
“The Holy Prophet (sa) began to arrange the Muslim army and appointed separate commanders for the various sections of the army. On this occasion, the Holy Prophet (sa) received news that the flag of the army of the Quraish was in the hands of Talha. Talha was from that dynasty, who under the administration of Qusayy bin Kilab, the paramount ancestor of the Quraish, held the right of standard-bearing in representation of the Quraish during wars. Upon becoming aware of this, the Holy Prophet (sa) said, ‘We are more worthy of demonstrating national loyalty,’ and then, the Holy Prophet (sa) took the flag of the Muhajirin from Hazrat Ali (ra) and entrusted it to Mus‘ab (ra) bin Umair, who was also a member of the very same dynasty to which Talhah belonged to.”
(Sirat Khatamun-Nabiyyin, Hazrat Mirza Bashir Ahmad (ra), p. 488)