Sunan an-Nasa'i Book 48, Hadith 13

"I came to the Prophet and I had hair. He said: 'This is bad,' and I thought he meant me, so I cut my hair then I came to him. He said to me: 'I didn't mean you, but this is better.'"

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"The Messenger of Allah forbade Al-Qaza' (to shave part of the head and leave part)."

Sunan an-Nasa'i Book 48, Hadith 12
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"The hair of the Prophet was wavy, neither curly nor straight, and (hung down) between his ears and his shoulders."

Sunan an-Nasa'i Book 48, Hadith 14