[Machine] That he should write to him about something that he heard from the Messenger of Allah ﷺ . So, he wrote to him saying: Whenever the Messenger of Allah ﷺ finished his prayer, he would say: "There is no god but Allah, alone, without partner. To Him belongs the dominion and to Him belongs all praise. He has power over all things. O Allah, none can withhold what You give, and none can give what You withhold, and no wealth or majesty can benefit anyone, for from You is all wealth and majesty."  

أَنِ اكْتُبْ إِلَيَّ بِشَيْءٍ سَمِعْتَهُ مِنْ رَسُولِ اللهِ ﷺ فَكَتَبَ إِلَيْهِ كَانَ إِذَا صَلَّى فَفَرَغَ قَالَ لَا إِلَهَ إِلَّا اللهُ وَحْدَهُ لَا شَرِيكَ لَهُ قَالَ ابْنُ عَوْنٍ فَأَظُنُّهُ قَالَ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ اللهُمَّ لَا مَانِعَ لِمَا أَعْطَيْتَ وَلَا مُعْطِيَ لِمَا مَنَعْتَ وَلَا يَنْفَعُ ذَا الْجَدِّ مِنْكَ الْجَدُّ