Qays ibn Abi Sa'sa'a RA was a Companion of the Banu Mazin ibn al-Najjar whom, Ibn Ishaq says, the Prophet ﷺ put over the rearguard on the march to Badr in 2 AH.
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Placed in charge of a backup/reinforcement group by the Prophet ﷺ at the Battle of Badr, according to one report.