Abu Hurairah said: "The Messenger of Allah ﷺ stood up to pray and we stood up with him. A Bedouin said- while he was praying- 'O Allah, have mercy on me and Muhammad and do not have mercy on anyone else.' When the Messenger of Allah ﷺ said the Salam, he said to the Bedouin: 'You have limited something vast," meaning the mercy of Allah (SWT)." (Using translation from Nasāʾī 1216)  

قَامَ رَسُولُ اللهِ ﷺ إِلَى الصَّلَاةِ وَقُمْنَا مَعَهُ فَقَالَ أَعْرَابِيٌّ وَهُوَ فِي الصَّلَاةِ اللهُمُ ارْحَمْنِي وَمُحَمَّدًا وَلَا تَرْحَمْ مَعَنَا أَحَدًا فَلَمَّا سَلَّمَ رَسُولُ اللهِ ﷺ قَالَ لِلْأَعْرَابِيِّ «لَقَدْ تَحَجَّرْتَ وَاسِعًا يُرِيدُ رَحْمَةَ اللهِ» خَالَفَهُ سُفْيَانُ بْنُ عُيَيْنَةَ  

[Machine] The Messenger of Allah ﷺ said, "You have indeed placed a large boulder."  

رَسُولُ اللهِ ﷺ «لَقَدْ تَحَجَّرْتَ وَاسِعًا»