Sahih al-Bukhari 5917 (Book 77, Hadith 132)
"The Prophet (ﷺ) used to let his hair hang down and the pagans used to part their hair, while the People of the Scripture used to let their hair hang down. The Prophet (ﷺ) liked to follow the People of the Scripture in matters about which he had not been instructed otherwise. Then the Prophet (ﷺ) parted his hair."
Key Takeaway
In Islamic scholarship, this Hadith is often used to discuss "Tashabbuh" (imitation). It shows that the Prophet’s practices sometimes evolved based on the social and religious context of the time, moving from following the People of the Scripture to establishing a unique practice for the arab community.