I heard the Messenger of Allah ﷺ delivering Khutbah during the farewell Hajj, and he was wearing a Burd which he had wrapped from under his armpit." She said: "I was look at muscle of his upper arm quivering and I heard him saying: O you people! Have Taqwa of Allah. If a mutilated Ethiopian slave is put in command over you, then listen to him and obey him, as long as he upholds the Book of Allah among you.'" (Using translation from Tirmidhī 1706)
رَأَيْتُ رَسُولَ اللهِ ﷺ فِي حَجَّةِ الْوَدَاعِ يَخْطُبُ عَلَى الْمِنْبَرِ عَلَيْهِ بُرْدٌ لَهُ قَدِ الْتَفَعَ بِهِ مِنْ تَحْتِ إِبْطِهِ قَالَتْ فَأَنَا أَنْظُرُ إِلَى عَضَلَةِ عَضُدِهِ تَرْتَجُّ فَسَمِعْتُهُ يَقُولُ يَا أَيُّهَا النَّاسُ اتَّقُوا اللهَ وَإِنْ أُمِّرَ عَلَيْكُمْ عَبْدٌ مُجَدَّعٌ فَاسْمَعُوا لَهُ وَأَطِيعُوا مَا أَقَامَ فِيكُمْ كِتَابَ اللهِ ﷻ