question #3 Sahih Muslim 644a, Book 5, Hadith 288 : Why is it important to adhere to the teachings of the Prophet Muhammad (ﷺ) regarding religious practices?

I heard the Messenger of Allah (ﷺ) as saying: Let the bedouin not gain upper hand over you in regard to the name of your prayer. See I (The night prayer should be called) ‘Isya’ (and the bedouins call it Atama (because) they milk their camels late.