question #3 Sahih Muslim 534c, Book 5, Hadith 33 : What is the importance of correcting others in prayer to ensure adherence to the Sunnah?

Have (people) behind you said prayer? They said: Yes. He stood between them (‘Alqama and Aswad). One was on his right aide and the other was on his left. We then bowed and placed our hands on our knees. He struck our hands and then putting his hands together, palm to palm, placed them between his thighs. When he completed the prayer he said: This is how the Messenger of Allah (ﷺ) used to do.