Sahih Bukhari
Prophetic Commentary on the Quran (Tafseer of the Prophet (PBUH))
Volume: 006 / Book Number: 060 / Hadith Number: 84
Narrated Al-Bara bin Azib:
The Prophet appointed 'Abdullah bin Jubair as the commander of the infantry during the battle of Uhud. They returned defeated, and that is what is meant by:--
"And the Apostle was calling them back in the rear. None remained with the Prophet then, but twelve men."