Mukhtasar Bukhari

Narrated Jabir bin Abdullah (may Allah be pleased with him): We were offering prayer with the Prophet (peace and blessings of Allah be upon him) when a caravan (from Syria) arrived carrying grain. The people turned towards the caravan until only twelve men remained with the Prophet (peace and blessings of Allah be upon him). Then this verse was revealed: "And when they saw a transaction or a diversion, they rushed to it and left you standing (O Prophet) in the sermon." (__QUR_N__ Al-Jumu'ah: 11)