The Book of Faith (Kitab Al-Iman)

Muslim :: Book 1 : Hadith 310

It is narrated on the the outhority of Anas b. Malik that the Messenger of Allah (may peace be upon him) said: (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).