Sahih Bukhari Volume 3, Book 34, Hadith 2059

حَدَّثَنَا طَلْقُ بْنُ غَنَّامٍ، حَدَّثَنَا زَائِدَةُ، عَنْ حُصَيْنٍ، عَنْ سَالِمٍ، قَالَ حَدَّثَنِي جَابِرٌ ـ رضى الله عنه ـ قَالَ بَيْنَمَا نَحْنُ نُصَلِّي مَعَ النَّبِيِّ صلى الله عليه وسلم إِذْ أَقْبَلَتْ مِنَ الشَّأْمِ عِيرٌ، تَحْمِلُ طَعَامًا، فَالْتَفَتُوا إِلَيْهَا، حَتَّى مَا بَقِيَ مَعَ النَّبِيِّ صلى الله عليه وسلم إِلاَّ اثْنَا عَشَرَ رَجُلاً فَنَزَلَتْ ‏{‏وَإِذَا رَأَوْا تِجَارَةً أَوْ لَهْوًا انْفَضُّوا إِلَيْهَا‏}‏

Narrated By Jabir : While we were offering the prayer with the Prophet 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)