Sunan an-Nasa'i 5078
سنن النسائي#5078SahihIt was narrated that Abu Dharr said:"The Messenger of Allah [SAW] said: 'The best things with which you can change gray hair are Henna and Katam
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Hasan
In-book reference: 48:39