Sahih Muslim Book - 43, Hadith - 6083

وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى ، حَدَّثَنَا أَبُو دَاوُدَ سُلَيْمَانُ بْنُ دَاوُدَ ، حَدَّثَنَا شُعْبَةُ ، عَنْ سِمَاكِ بْنِ حَرْبٍ ، قَالَ : سَمِعْتُ جَابِرَ بْنَ سَمُرَةَ ، سُئِلَ عَنْ شَيْبِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ : كَانَ إِذَا دَهَنَ رَأْسَهُ لَمْ يُرَ مِنْهُ شَيْءٌ ، وَإِذَا لَمْ يَدْهُنْ رُئِيَ مِنْهُ.

It was narrated that Simak bin Harb said: “I heard Jabir bin Samurah being asked about the white hair of the Prophet (s.a.w). He said: ‘When he (s.a.w) put oil on his hair none of them could be seen, and if he did not put oil on his hair, they could be seen.”’