It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that once a caravan arrived in Madinah Munawwarah while the Prophet (peace and blessings be upon him) was delivering a sermon. All the people left following the caravan, and only twelve men remained seated in the mosque. Upon this, the following verse was revealed: «وَإِذَارَأَوْاتِجَارَةًأَوْلَهْوًاانْفَضُّواإِلَيْهَا» etc.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 14356