Sahih Muslim Book 4, Hadith Number 1877.

Chapter : Concerning the two sermons before the Friday prayer and sitting for a while between the two.

Jabir b. Abdullah reported that the Apostle (may peace be upon him) was delivering the sermon on Friday in a standing posture when a caravan from Syria arrived. The people flocked towards it till no one was left (with the Holy Prophet) but twelve persons, and it was on this occasion that this verse in regard to Jumu’a was revealed. “And when they see merchandise or sport, they break away to it and leave thee standing.”