´It was narrated that Simak said:` "I heard Jabir bin Samurah being asked about the gray hairs of the Prophet [SAW]. 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.'"
Hadith ReferenceSunan an-Nasa'i / The Book of Adornment / Hadith: 5117
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم