Narrated Abdullah ibn Abbas: When a man who had dyed himself with henna passed by the Prophet ﷺ, he said: How fine this is! When another man who had dyed himself with henna and katam passed by, he said: This is better than that. Then another man who had dyed himself with yellow dye, passed by, he said: This is better than all that.

Narrated Abu Dharr: The Prophet ﷺ said: The best things with which grey hair are changed are henna and katam.