Sunan Ibn Mājah 3628✓ 5Sahih
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا زُهَيْرٌ، عَنْ أَبِي إِسْحَاقَ، عَنْ أَبِي جُحَيْفَةَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ هَذِهِ مِنْهُ بَيْضَاءُ . يَعْنِي عَنْفَقَتَهُ .
It was narrated that Abu Juhaifah said:"I saw the Messenger of Allah (ﷺ), and this part of his hair was white" - meaning the tuft of hair between the lower lip and the chin