Dyeing the Beard Black
Question :
What is the ruling concerning dyeing the beard black, and regarding the one who does it?
Answer:
It is not allowed to dye your hair black regardless whether it is your beard or the hair on your head. Certain sayings of the Messenger of Allah ﷺ indicate that dyeing one's hair to red, yellow, or with a mixture of henna and Katam. He ﷺ clearly said :
"Change this whiteness in the hair, but stay away from black."
Recorded by Muslim in his Sahih, and Abu Dawud, An-Nasa'i, and Ibn Majah - in a Hadith related by Jabir bin 'Abdullah, may Allah be pleased with him.
In another Hadith that is related by Abu Hurairah, may Allah be pleased with him, the Messenger of Allah ﷺ said:
"Indeed, neither the Jews nor the Christians dye their hair, so differ from them."
And Allâh is the Granter of success.
Source:
Ibn Baz
Fatawa Islamiyah, Vol. 8 Pages 243-244