The Jews and the Christians do not dye (their hair), so oppose them.
Sahih Muslim Book 37, Hadith 125
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Change it with something but avoid black.
Sahih Muslim Book 37, Hadith 124 Next Hadith → Never has Allah or His messengers (angels) ever broken their promise. Then he cast a glance (and by chance) found a puppy under his cot and said: 'A'isha, when did this dog enter here? She said: By Allah, I don't know He then commanded and it was turned out. Then Gabriel came and Allah's Messenger (ﷺ) said to him: You promised me and I waited for you, but you did not come, whereupon he said: It was the dog in your house which prevented me (to come), for we (angels) do not enter a house in which there is a dog or a picture.
Sahih Muslim Book 37, Hadith 126
Sahih Muslim Book 37, Hadith 124 Next Hadith → Never has Allah or His messengers (angels) ever broken their promise. Then he cast a glance (and by chance) found a puppy under his cot and said: 'A'isha, when did this dog enter here? She said: By Allah, I don't know He then commanded and it was turned out. Then Gabriel came and Allah's Messenger (ﷺ) said to him: You promised me and I waited for you, but you did not come, whereupon he said: It was the dog in your house which prevented me (to come), for we (angels) do not enter a house in which there is a dog or a picture.
Sahih Muslim Book 37, Hadith 126