Narrated `Abdullah bin `Abbas: The Prophet used to keep his hair falling loose while the pagans used to part their hair, and the People of the Scriptures used to keep their hair falling loose, and the Prophet liked to follow the People of the Scriptures in matters about which he had not been instructed differently, but later on the Prophet started parting his hair.

Narrated Ibn `Abbas: Allah's Apostle used to let his hair hang down while the infidels used to part their hair. The people of the Scriptures were used to letting their hair hang down and Allah's Apostle liked to follow the people of the Scriptures in the matters about which he was not instructed otherwise. Then Allah's Apostle parted his hair.

Narrated Ibn `Abbas: The Prophet 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 let his hair hang down first, but later on he parted it.