(the servant of the Prophet) When the Prophet ﷺ arrived (at Medina), there was not a single companion of the Prophet ﷺ who had grey and black hair except Abu Bakr, and he dyed his hair with Henna' and Katam (i.e. plants used for dying hair).
عَنْ أَنَسٍ خَادِمِ النَّبِيِّ ﷺ قَالَ قَدِمَ النَّبِيُّ ﷺ وَلَيْسَ فِي أَصْحَابِهِ أَشْمَطُ غَيْرَ أَبِي بَكْرٍ فَغَلَفَهَا بِالْحِنَّاءِ وَالْكَتَمِ