Mishkat al-Masabih 4 Prayer كتاب الصلاة 795

وَعَنْ مُعَاذِ بْنِ أَنَسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنِ الْحُبْوَةِ يَوْمَ الْجُمُعَةِ وَالْإِمَامُ يَخْطُبُ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ

Mu`adh b. Anas said that the Prophet forbade sitting on Friday with a cloth tied round the back and legs while the imam is preaching. Tirmidhi and Abu Dawud transmitted it.