Musannaf Ibn Abi Shayba 36:23

Yunus ibn Muhammad narrated to us, he said: Hammad ibn Salamah narrated to us, from Thabit, from Anas, that Gabriel came to the Messenger of Allah (may Allah bless him and grant him peace) while he was playing with the boys. He took him and laid him down, then he split open his chest and extracted the heart. Then he extracted a blood clot from it and said, "This is the portion of Satan from you." Then he washed it in a basin of gold with Zamzam water, then he joined it together, then he returned it to its place. He said: The boys came running to his mother—meaning his wet nurse—and said, "Muhammad has been killed." He said: So they went to meet him, and he was pale in color. Anas said: I used to see the mark of the stitching on his chest.