Mishkat al-Masabih
Mishkat al-Masabih 4423
Arabic hadith text
وَعَنْ أَبِي هُرَيْرَةَ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِنَّ الْيَهُودَ وَالنَّصَارَى لَا يَصبِغون فخالفوهم»
Translation
Abu Hurayra reported that the Prophet ﷺ said, “The Jews and Christians do not dye their hair, so be different from them.”