Sahih Muslim Book 1, Hadith Number 310.

Chapter : Night journey of the Messenger of Allah (may peace be upon him) to Heaven and the prayer made obligatory.

It is narrated on the authority 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 Zam-Zam and my heart was opened and washed with the water of Zam-Zam and then I was left (at my place).