question #1 Sahih Muslim 398b, Book 4, Hadith 50 : What is the significance of reciting Quranic verses during prayer according to Islamic teachings?

The Messenger of Allah (ﷺ) observed the Zuhr prayer and a person recited Sabbih Isma Rabbik al-a’la (Glorify the name of thy Lord, the Most High) behind him. When he (the Holy Pro- phet) concluded the prayer he said: Who amongst you recited (the above-mentioned verse) or who amongst you was the reciter? A person said: It was I. Upon this he (the Holy Prophet) observed: I thought as if someone amongst you was disputing with me (in what I was reciting).