While we were offering the prayer with the Prophet ﷺ a caravan carrying food came from Sham. The people looked towards the caravan (and went to it) and only twelve persons remained with the Prophet. So, the Divine Inspiration came; "But when they see some bargain or some amusement, they disperse headlong to it." (62.11)  

بَيْنَمَا نَحْنُ نُصَلِّي مَعَ النَّبِيِّ ﷺ إِذْ أَقْبَلَتْ مِنَ الشَّأْمِ عِيرٌ تَحْمِلُ طَعَامًا فَالْتَفَتُوا إِلَيْهَا حَتَّى مَا بَقِيَ مَعَ النَّبِيِّ ﷺ إِلاَّ اثْنَا عَشَرَ رَجُلاً فَنَزَلَتْ {وَإِذَا رَأَوْا تِجَارَةً أَوْ لَهْوًا انْفَضُّوا إِلَيْهَا}