Anas reported that person at Baqi' called another person as Abu'l- Qasim, and Allah's Messenger ( صلی اللہ علیہ وسلم ) 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 ( صلی اللہ علیہ وسلم ) said: You may call yourself by my name, but not by my kunya.