question #2 Sahih Muslim 208b, Book 1, Hadith 415 : How did the Prophet Muhammad (ﷺ) convey important messages to his followers?

One day the Messenger of Allah (ﷺ) climbed the hill of Safa’ and said: Be on your guard, and the rest of the hadith was narrated like the hadith transmitted by Usama; he made no mention of the revelation of the verse:” Warn thy nearest kindred.”