I'm going to kill you one day!
Said to the Prophet ﷺ in Makkah, years before Uhud; both men were of Quraysh.
I have a special horse that I am feeding the best barley and grain, in order that it grows fat and healthy so that I can kill you while I ride it!
No. Actually, I will be the one killing you, insha'Allah.
The only recorded instance of the Prophet ﷺ ever responding to a taunt in kind.