Virtues and Merits of the Prophet (pbuh) and his Companions
Bukhari :: Book 4 :: Volume 56 :: Hadith 758
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.
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