Narrated Anas bin Malik:

The night Allah's Messenger (s.a.w.a.) was taken for a journey from the sacred mosque (of Mecca) Al-Ka`ba: Three persons came to him (in a dreamy while he was sleeping in the Sacred Mosque before the Divine Inspiration was revealed to Him. One of them said, "Which of them is he?" The middle (second) angel said, "He is the best of them." The last (third) angle said, "Take the best of them." Only that much happened on that night and he did not see them till they came on another night, i.e. after The Divine Inspiration was revealed to him. (Fath-ul-Bari Page 258, Vol. 17) and he saw them, his eyes were asleep but his heart was not----and so is the case with the prophets: their eyes sleep while their hearts do not sleep. So those angels did not talk to him till they carried him and placed him beside the well of Zamzam. From among them Gabriel took charge of him. Gabriel cut open (the part of his body) between his throat and the middle of his chest (heart) and took all the material out of his chest and `Abdomen and then washed it with Zamzam water with his own hands till he cleansed the inside of his body, and then a gold tray containing a gold bowl full of belief and wisdom was brought and then Gabriel stuffed his chest and throat blood vessels with it and then closed it (the chest). He then ascended with him to the heaven of the world.........

Anas b. Malik reported that Gabriel came to the Messenger of Allah (s.a.w.a.) while he was playing with his playmates. He took hold of him and lay him prostrate on the ground and tore open his breast and took out the heart from it and then extracted a blood-clot out of it and said:

That was the part of Satan in thee. And then he washed it with the water of Zamzam in a golden basin and then it was joined together and restored to it place. The boys came running to his mother, i. e. his nurse, and said: Verily Muhammad has been murdered. They all rushed toward him (and found him all right) His color was changed, Anas said. I myself saw the marks of needle on his breast.