"I heard Jabir bin Samurah being asked about the gray hairs of the Prophet (ﷺ). He said: 'If he put oil on his head they could not be seen, but if he did not put oil on his head, they could be seen.'"
Reference: Sunan an-Nasa'i 5114 In-book : Book 48, Hadith 75 English translation : Vol. 6, Book 48, Hadith 5117
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