Chapter 39: The Book of Manners and Etiquette
Anas reported that person at Baqi' called another person as" Abu' l- Qasim," and Allah' s Messenger (ﷺ) turned towards him. He (the person who had uttered these words) said: Messenger of Allah, I did not mean you, but I called such and such (person), whereupon Allah' s Messenger (ﷺ) said: You may call yourself by my name, but not by my kunya.
Sahih Muslim 2131