question #3 Sahih Muslim 644b, Book 5, Hadith 289 : Why is it important to adhere to the names of prayers as prescribed in Islamic texts?

The Messenger of Allah (ﷺ) said: Let the bedouin not gain upper band over you In regard to the name of your prayer, i. e. night prayer, for it is mentioned ‘Isya’ in the Book of Allah (i. e. the Qur’an). (The bedouin call it ‘Atama because) they make delay in milling their she-camels.