عَنْ قُطْبَةَ بْنِ مَالِكٍ رَضِيَ اللَّهُ عَنْهُ عَمِّ زِيَادِ بْنِ عِلَاقَةَ قَالَ: نَالَ الْمُغِيرَةُ بْنُ شُعْبَةَ رَضِيَ اللَّهُ عَنْهُ مِنْ عَلِيِّ رَضِيَ اللَّهُ عَنْهُ، فَقَالَ لَهُ زَيْدُ بْنُ أَرْقَمَ رَضِيَ اللَّهُ عَنْهُ: قَدْ عَلِمْتَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يَنْهَى عَنْ سَبِّ الْمَوْتَى، فَلِمَ تَسُبُّ عَلِيًّا وَقَدْ مَاتَ
Qutbah bin Malik says that when Sayyiduna Mughirah bin Shu’bah (may Allah be pleased with him) spoke some inappropriate words about Sayyiduna Ali (may Allah be pleased with him), Sayyiduna Zaid bin Arqam (may Allah be pleased with him) said to him: Do you know that the Messenger of Allah (peace and blessings be upon him) used to forbid speaking ill of the dead, so why do you speak ill of Sayyiduna Ali (may Allah be pleased with him) when he has passed away?