the Prophet of Allah said: “While I was at the House, between sleeping and being awake, I heard someone saying: “The one in the middle of the three.’ I was brought a vessel of gold containing Zamzam water, so my chest was split, to here.’” – Qatadah said: “I said to Anas: ‘What does that mean?’ He said: ‘To the lowest part of his stomach.’” – He said: “So my heart was removed, and washed with Zamzam water, then returned to its placed. Then I was filled with Faith and wisdom.”There is a long story with this Hadith.  

أَنَّ النَّبِيَّ ﷺ قَالَ بَيْنَمَا أَنَا عِنْدَ الْبَيْتِ بَيْنَ النَّائِمِ وَالْيَقْظَانِ إِذْ سَمِعْتُ قَائِلاً يَقُولُ أَحَدٌ بَيْنَ الثَّلاَثَةِ فَأُتِيتُ بِطَسْتٍ مِنْ ذَهَبٍ فِيهَا مَاءُ زَمْزَمَ فَشَرَحَ صَدْرِي إِلَى كَذَا وَكَذَا قَالَ قَتَادَةُ قُلْتُ يَعْنِي قُلْتُ لأَنَسِ بْنِ مَالِكٍ مَا يَعْنِي قَالَ إِلَى أَسْفَلِ بَطْنِي فَاسْتُخْرِجَ قَلْبِي فَغُسِلَ قَلْبِي بِمَاءِ زَمْزَمَ ثُمَّ أُعِيدَ مَكَانَهُ ثُمَّ حُشِيَ إِيمَانًا وَحِكْمَةً وَفِي الْحَدِيثِ قِصَّةٌ طَوِيلَةٌ