Virtues and Merits of the Prophet (pbuh) and his Companions

Bukhari :: Book 4 :: Volume 56 :: Hadith 737

Narrated Anas:

While the Prophet was in the market, a man called (somebody), "O Abu-l-Qasim!' The Prophet turned to him and said "Name yourselves after me but do not call yourselves by my Kuniya."

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