Ibn Umar used to dye his beard with yellow colour so much so that his clothes were filled (dyed) with yellowness. He was asked: Why do you dye with yellow colour? He replied: I saw the Messenger of Allah (ﷺ) dyeing with yellow colour, and nothing was dearer to him than it. He would dye all his clothes with it, even his turban.
Reference: Sunan Abi Dawud 4064 In-book : Book 34, Hadith 45 English translation : Book 33, Hadith 4053
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