Sa'id bin Abi 'Aruba سعيد بن أبي عروبة · Chapters on Dress

“The Messenger of Allah (ﷺ) said: ‘The best thing with which you can dye your hair is this black (dye). It makes your women desire you and creates fear in the hearts of your enemies.’”

“I see that you dye your beard yellow with Wars.” Ibn ‘Umar said: “As for my dyeing of my beard yellow with Wars, I saw the Messenger of Allah (ﷺ) dyeing his beard yellow.”