Sahih al-Bukhari, Book 34, Hadith 74 (In-Book) ⓘ
Narrated Anas: A man at Al-Baqi' called, "O Abul-Qasim!" The Prophet turned to him and the man said (to the Prophet ), "I did not intend to call you." The prophet said, "Name yourselves by my name but not by my Kunya (name).
حَدَّثَنَا مَالِكُ بْنُ إِسْمَاعِيلَ، حَدَّثَنَا زُهَيْرٌ، عَنْ حُمَيْدٍ، عَنْ أَنَسٍ ـ رضى الله عنه ـ دَعَا رَجُلٌ بِالْبَقِيعِ يَا أَبَا الْقَاسِمِ. فَالْتَفَتَ إِلَيْهِ النَّبِيُّ صلى الله عليه وسلم فَقَالَ لَمْ أَعْنِكَ. قَالَ " سَمُّوا بِاسْمِي، وَلاَ تَكْتَنُوا بِكُنْيَتِي " .
also referenced under: Hadith 2121 (DarusSalam) & Volume 3, Book 34, Hadith 332 (USC-MSA)