The Book of Forgetfulness (In Prayer)
13/20. Chapter:
Speaking During the prayer
Sunan an-Nasai
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 " .
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."
Reference : Sunan an-Nasa'i 1217In-book reference : Book 13, Hadith 39English translation : Vol. 2, Book 13, Hadith 1218