question #3 Sahih Muslim 676, Book 5, Hadith 377 : What is the purpose of invoking blessings on Muslims and curses on unbelievers during prayer?

I would say prayer along with you which is near to the prayer of the Messenger of Allah (ﷺ). and Abu Huraira recited Qunut in the noon and in the ‘Isya’ and in the morning prayer, and invoked blessing (of Allah) upon Muslims-and curse upon the unbelievers.