3 chains merged

When he oiled his head nothing was seen (as a mark of old age) and when he did not apply oil something (of the old age) became visible.

"I heard Jabir bin Samurah being asked about the gray hairs of the Prophet (ﷺ) [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.'"

"When he oiled his head, no grayness was visible, and when he did not apply oil, some was visible.”