Sunan an-Nasa'i 5081

Arabic

أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، قَالَ حَدَّثَنَا عَبْدُ الْوَارِثِ، قَالَ حَدَّثَنَا الْجُرَيْرِيُّ، عَنْ عَبْدِ اللَّهِ بْنِ بُرَيْدَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ إِنَّ أَحْسَنَ مَا غَيَّرْتُمْ بِهِ الشَّيْبَ الْحِنَّاءُ وَالْكَتَمُ ‏"‏ ‏.‏

Translation

It was narrated that 'Abdullah bin Buraidah said:"The Messenger of Allah [SAW] said: 'The best things with which you can change gray hair are Henna and Katam

Authenticity

Sahih · Abu Ghuddah

Reference