Mishkat al-Masabih 22 Clothing كتاب اللباس 167

وَعَن عُثْمَانَ بْنِ عَبْدِ اللَّهِ بْنِ مَوْهَبٍ قَالَ: دَخَلْتُ عَلَى أُمِّ سَلَمَةَ فَأَخْرَجَتْ إِلَيْنَا شَعْرًا مِنْ شَعْرِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مخضوبا. رَوَاهُ البُخَارِيّ

‘Uthman b. ‘Abdallah b. Mauhib said : I went to visit Umm Salama and she brought out for us some hairs of the Prophet which had been dyed. Bukhari transmitted it.