question #3 Sahih Muslim 602a, Book 5, Hadith 194 : Why is it important to maintain tranquillity when going to join a congregational prayer?

I heard the Messenger of Allah (ﷺ) saying: When the Iqama has been pronounced for prayer, do not go running to it, but go walking in tranquillity and pray what you are in time for, and complete what you have missed.