question #1 Sahih Muslim 162c, Book 1, Hadith 318 : What is the significance of the event where Gabriel purified the heart of the Prophet Muhammad (ﷺ) during his childhood?

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.