عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((مَنْ تَكَلَّمَ يَوْمَ الْجُمُعَةِ وَهُوَ يَخْطُبُ فَهُوَ كَمَثَلِ الْحِمَارِ يَحْمِلُ أَسْفَارًا وَالَّذِي يَقُولُ لَهُ أَنْصِتْ لَيْسَ لَهُ جُمُعَةٌ))
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: Whoever speaks on the day of Jumu’ah while the Imam is delivering the sermon is like a donkey carrying many books, and whoever says to him, “Be silent,” his Jumu’ah will also not be valid.