When Banu Quraizah capitulated agreeing to accept Sa’d’s judgement, the Prophet ﷺ sent a messenger to him. When he came riding on a white ass, the prophet ﷺ said: stand up to (show respect to) your chief, or he said : “to the best of you”. He came and sat beside the Messenger of Allah (May peace be upon him).
أَنَّ أَهْلَ قُرَيْظَةَ لَمَّا نَزَلُوا عَلَى حُكْمِ سَعْدٍ أَرْسَلَ إِلَيْهِ النَّبِيُّ ﷺ فَجَاءَ عَلَى حِمَارٍ أَقْمَرَ فَقَالَ النَّبِيُّ ﷺ قُومُوا إِلَى سَيِّدِكُمْ أَوْ إِلَى خَيْرِكُمْ فَجَاءَ حَتَّى قَعَدَ إِلَى رَسُولِ اللَّهِ ﷺ