From Sahih Bukhari (Hadith 6010):
Narrated Abu Huraira:Allah's Messenger (ﷺ) stood up for the prayer and we too stood up along with him. Then a bedouin shouted while offering prayer. "O Allah! Bestow Your Mercy on me and Muhammad only and do not bestow it on anybody else along with us." When the Prophet (ﷺ) had finished his prayer with Taslim, he said to the Bedouin, "You have limited (narrowed) a very vast (thing)," meaning Allah's Mercy
Reference: Bukhari 6010