Sunan an-Nasa'i 452
سنن النسائي#452Sahihأَخْبَرَنَا سُلَيْمَانُ بْنُ دَاوُدَ، عَنِ ابْنِ وَهْبٍ، قَالَ أَخْبَرَنِي عَمْرُو بْنُ الْحَارِثِ، أَنَّ عَبْدَ رَبِّهِ بْنَ سَعِيدٍ، حَدَّثَهُ أَنَّ الْبُنَانِيَّ حَدَّثَهُ عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ الصَّلَوَاتِ، فُرِضَتْ بِمَكَّةَ وَأَنَّ مَلَكَيْنِ أَتَيَا رَسُولَ اللَّهِ صلى الله عليه وسلم فَذَهَبَا بِهِ إِلَى زَمْزَمَ فَشَقَّا بَطْنَهُ وَأَخْرَجَا حَشْوَهُ فِي طَسْتٍ مِنْ ذَهَبٍ فَغَسَلاَهُ بِمَاءِ زَمْزَمَ ثُمَّ كَبَسَا جَوْفَهُ حِكْمَةً وَعِلْمًا .
It was narrated from Anas bin Malik that the prayers were enjoined in Makkah, and that two angels came to the Messenger of Allah (ﷺ) and took him to Zamzam, where they split open his stomach and took out his innards in a basin of gold, and washed them with Zamzam water, then they filled his heart with wisdom and knowledge
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 5:5