(11) بَابُ: {وَإِذَا رَأَوْا تِجَارَةً أَوْ لَهْوًا انْفَضُّوا إِلَيْهَا}
Narrated Jabir:
A caravan arrived (at Medina) while we were offering the Jumua prayer with the Prophet. The people left out for the caravan, with the exception of twelve persons. Then this Verse was revealed: 'But when they see some bargain or some amusement, they disperse headlong to it and leave you standing." (62.11)
Reference: Sahih al-Bukhari 2064
In-book reference: Book 34, Hadith 17
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 278