A Bedouin entered the masjid and prayed two rak'ahs, then he said: "O Allah, have mercy on me and on Muhammad and do not have mercy on anyone else." The Messenger of Allah (ﷺ) said: "You have limited something vast."
Reference: Sunan an-Nasa'i 1217 In-book : Book 13, Hadith 39 English translation : Vol. 2, Book 13, Hadith 1218
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