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.  

وَأَنَّ مَلَكَيْنِ أَتَيَا رَسُولَ اللَّهِ ﷺ فَذَهَبَا بِهِ إِلَى زَمْزَمَ فَشَقَّا بَطْنَهُ وَأَخْرَجَا حَشْوَهُ فِي طَسْتٍ مِنْ ذَهَبٍ فَغَسَلاَهُ بِمَاءِ زَمْزَمَ ثُمَّ كَبَسَا جَوْفَهُ حِكْمَةً وَعِلْمًا