Narrated Ibn `Abbas
The Prophet (ﷺ) used to copy the people of the Scriptures in matters in which there was no order from Allah. The people of the Scripture used to let their hair hang down while the pagans used to part their hair. So the Prophet (ﷺ) let his hair hang down first, but later on he parted it.
Narrated `Aisha
As if I am now looking at the shine of the hair parting of the Prophet (ﷺ) while he was in the state of lhram.