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It was narrated from Abu Hurairah that:

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."
أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ الزُّهْرِيُّ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ أَحْفَظُهُ مِنَ الزُّهْرِيِّ قَالَ أَخْبَرَنِي سَعِيدٌ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ أَعْرَابِيًّا، دَخَلَ الْمَسْجِدَ فَصَلَّى رَكْعَتَيْنِ ثُمَّ قَالَ اللَّهُمَّ ارْحَمْنِي وَمُحَمَّدًا وَلاَ تَرْحَمْ مَعَنَا أَحَدًا ‏.‏ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ لَقَدْ تَحَجَّرْتَ وَاسِعًا ‏"‏ ‏.‏

Classification

Sahih (Authentic)

References

• Sunan an-Nasa'i, 1217
• Sunan an-Nasa'i, Vol. 2, Book of Forgetfulness (In Prayer), Hadith 1218
• Sunan an-Nasa'i, Book of Forgetfulness (In Prayer), Hadith 1218