question #1 Sahih Muslim 770, Book 6, Hadith 239 : What is the significance of invoking the names of angels like Gabriel, Michael, and Israfil in prayers?

I asked ‘A’isha, the mother of the believers, (to tell me) the words with which the Messenger of Allah (ﷺ) commenced the prayer when he got up at night. She said: When he got up at night he would commence his prayer with these words: O Allah, Lord of Gabriel, and Michael, and Israfil, the Creator of the heavens and the earth, Who knowest the unseen and the seen; Thou decidest amongst Thy servants concerning their differences. Guide me with Thy permission in the divergent views (which the people) hold about Truth, for it is Thou Who guidest whom Thou wilt to the Straight Path.