Sahih Muslim 864
Sahih Muslim · Book 7: The Book of Prayer - Friday · The verse: “And when they see some merchandise or some amusement they disperse headlong to it, and leave you standing”
Ka'b b. 'Ujra reported that he entered the mosque and saw Abd al-Rahman b. Umm Hakam delivering the sermon in a sitting posture. Upon this he said:
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى ، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ ، حَدَّثَنَا شُعْبَةُ ، عَنْ مَنْصُورٍ ، عَنْ عَمْرِو بْنِ مُرَّةَ ، عَنْ أَبِي عُبَيْدَةَ ، عَنْ كَعْبِ بْنِ عُجْرَةَ ، قَالَ دَخَلَ الْمَسْجِدَ وَعَبْدُ الرَّحْمَنِ بْنُ أُمِّ الْحَكَمِ يَخْطُبُ قَاعِدًا فَقَالَ انْظُرُوا إِلَى هَذَا الْخَبِيثِ يَخْطُبُ قَاعِدًا وَقَالَ اللَّهُ تَعَالَى { وَإِذَا رَأَوْا تِجَارَةً أَوْ لَهْوًا انْفَضُّوا إِلَيْهَا وَتَرَكُوكَ قَائِمًا}
Look at this wretched person; he delivers the sermon while sitting, whereas Allah said:" And when they see merchandise or sport, they break away to it and leave thee standing."