Hadith
أَخْبَرَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ، عَنْ سُفْيَانَ، عَنْ إِيَادِ بْنِ لَقِيطٍ، عَنْ أَبِي رِمْثَةَ، قَالَ أَتَيْتُ أَنَا وَأَبِي النَّبِيَّ، صلى الله عليه وسلم وَكَانَ قَدْ لَطَخَ لِحْيَتَهُ بِالْحِنَّاءِ .
It was narrated that Abu Rimthah said:"My father and I came to the Prophet [SAW] and he had dyed his beard with Henna
Sahih · Abu Ghuddah
Sunan an-Nasa'i 5083 ·Book 48, Hadith 44·Also available on sunnah.com·