Sunan an-Nasā'ī 5082✓ 5Sahih
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، قَالَ حَدَّثَنَا الْمُعْتَمِرُ، قَالَ سَمِعْتُ كَهْمَسًا، يُحَدِّثُ عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِنَّ أَحْسَنَ مَا غَيَّرْتُمْ بِهِ الشَّيْبَ الْحِنَّاءُ وَالْكَتَمُ " .
It was narrated from 'Abdullah bin Buraidah that: He heard that the Messenger of Allah [SAW] said: "The best things with which you can change gray hair are Henna and Katam