When Qais bin Saʿd Al-Ansari, who used to carry the flag of the Prophet, intended to perform Hajj, he combed his hair.  

بْنَ سَعْدٍ الأَنْصَارِيّ َ ؓ وَكَانَ صَاحِبَ لِوَاءِ رَسُولِ اللَّهِ ﷺ أَرَادَ الْحَجَّ فَرَجَّلَ  

Ali remained behind the Prophet ﷺ during the battle of Khaibar as he way suffering from some eye trouble but then he said, "How should I stay behind Messenger of Allah ﷺ?" So, he set out till he joined the Prophet. On the eve of the day of the conquest of Khaibar, Messenger of Allah ﷺ said, "(No doubt) I will give the flag or, tomorrow, a man whom Allah and His Apostle love or who loves Allah and His apostle will take the flag. Allah will bestow victory upon him." Suddenly 'Ali joined us though we were not expecting him. The people said, "Here is 'Ali. "So, Messenger of Allah ﷺ gave the flag to him and Allah bestowed victory upon him.  

كَانَ عَلِيٌّ ؓ تَخَلَّفَ عَنِ النَّبِيِّ ﷺ فِي خَيْبَرَ وَكَانَ بِهِ رَمَدٌ فَقَالَ أَنَا أَتَخَلَّفُ عَنْ رَسُولِ اللَّهِ ﷺ فَخَرَجَ عَلِيٌّ فَلَحِقَ بِالنَّبِيِّ ﷺ فَلَمَّا كَانَ مَسَاءُ اللَّيْلَةِ الَّتِي فَتَحَهَا فِي صَبَاحِهَا فَقَالَ رَسُولُ اللَّهِ ﷺ لأُعْطِيَنَّ الرَّايَةَ أَوْ قَالَ لَيَأْخُذَنَّ غَدًا رَجُلٌ يُحِبُّهُ اللَّهُ وَرَسُولُهُ أَوْ قَالَ يُحِبُّ اللَّهَ وَرَسُولَهُ يَفْتَحُ اللَّهُ عَلَيْهِ فَإِذَا نَحْنُ بِعَلِيٍّ وَمَا نَرْجُوهُ فَقَالُوا هَذَا عَلِيٌّ فَأَعْطَاهُ رَسُولُ اللَّهِ ﷺ فَفَتَحَ اللَّهُ عَلَيْهِ  

I heard Al Abbas telling Az-Zubair, "The Prophet ﷺ ordered you to fix the flag here."  

سَمِعْتُ الْعَبَّاسَ يَقُولُ لِلزُّبَيْرِ ؓ هَا هُنَا أَمَرَكَ النَّبِيُّ ﷺ أَنْ تَرْكُزَ الرَّايَةَ