question #1 Sahih al-Bukhari 1078, Book 17, Hadith 12 : What is the significance of following the actions of the Prophet Muhammad (ﷺ) in Islamic practice?

I offered the `Isha’ prayer behind Abu Huraira and he recited Idhas-Sama’ Un-Shaqqat, and prostrated.
I said, “What is this?” Abu Huraira said, “I prostrated behind Abul-Qasim and I will do the same till I
meet him.”