Mishkat al-Masabih
Mishkat al-Masabih 4425
Arabic hadith text
وَعَنِ ابْنِ عَبَّاسٍ قَالَ: كَانَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يُحِبُّ مُوَافَقَةَ أَهْلِ الْكِتَابِ فِيمَا لَمْ يُؤْمَرْ فِيهِ وَكَانَ أَهْلُ الْكِتَابِ يَسْدُلُونَ أَشْعَارَهُمْ وَكَانَ الْمُشْرِكُونَ يَفْرِقُونَ رؤوسهم فَسَدَلَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَاصِيَتَهُ ثمَّ فرق بعدُ
Translation
Ibn Abbas reported: The Prophet ﷺ liked to agree with the People of the Book in matters about which he had received no instruction. The People of the Book let their hair hang loose, while the polytheists parted their hair. The Prophet ﷺ let his forelock hang, then later parted his hair.