Jabir said:
"The Prophet was standing and delivering a Khutbah for us on one Friday, when a caravan arrived in Al-Madinah. So the Companions of the Messenger of Allah rushed off until only twelve men remained. Among them were Abu Bakr and Umar. And This Ayah was revealed: And when they see some merchandise or some amusement, they disperse headlong to it." (ID)
English reference (ID): Vol. 5, Book 44, Hadith 3311 (ID)
Arabic reference (ID): Book 47, Hadith 3626 (ID)