Anas reported that person at Baqi called another person as "Abul- Qasim," and Allahs 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 Allahs Messenger ﷺ said: You may call yourself by my name, but not by my kunya.