(the angels) came to me and took me to the Zamzam and my heart was opened and washed with the water of Zamzam and then I was left (at my place). (Using translation from Muslim 162b)
"أُتيت فانطُلِق بي إلى زَمْزَم، فشُرِحَ صدرِي، ثمَّ غُسِل بماءِ زمزم، ثمَّ أُنزِلْتُ".