ENOfficial
Mu`adh b. Anas said that the Prophet (ﷺ) forbade sitting on Friday with a cloth tied round the back and legs while the imam is preaching. Tirmidhi and Abu Dawud transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ مُعَاذِ بْنِ أَنَسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنِ الْحُبْوَةِ يَوْمَ الْجُمُعَةِ وَالْإِمَامُ يَخْطُبُ. رَوَاهُ التِّرْمِذِيُّ وَأَبُو دَاوُدَ
sunnah.com