Sahih al-Bukhari 2121

Malik ibn Ismail narrated to us: Zuhayr narrated to us, from Humayd, from Anas, may Allah be pleased with him: A man at al-Baqi called out, “O Abu al-Qasim.” The Prophet turned toward him, and the man said, “I did not mean you.” The Prophet said, “Name yourselves with my name, but do not use my kunya.”