حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، قَالَ‏:‏ أَخْبَرَنَا أَبُو دَاوُدَ، قَالَ‏:‏ أَخْبَرَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ‏:‏ قُلْتُ لأَنَسِ بْنِ مَالِكٍ‏:‏ هَلْ خَضَبَ رَسُولُ اللهِ صلى الله عليه وسلم‏؟‏ قَالَ‏:‏ لَمْ يَبْلُغْ ذَلِكَ، إِنَّمَا كَانَ شَيْبًا فِي صُدْغَيْهِ وَلَكِنْ أَبُو بَكْرٍ، خَضَبَ بِالْحِنَّاءِ وَالْكَتَمِ‏.‏

Jabir ibn Samura was asked about the grayness of Allah’s Messenger (Allah bless him and give him peace), so he said

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