The last thing which the Messenger of Allah (ﷺ) instructed me was: When you lead the people in prayer, be brief.
Sahih Muslim Book 4, Hadith 213
← Previous Hadith The Apostle of Allah (ﷺ) said to him: Lead your people in prayer. I said: Messenger of Allah. I perceive something (disturbing) in my soul. He (the Holy Prophet) asked me to draw near him and making me sit down in front of him he placed his hand on my breast between my nipples. and then, telling me to turn round, he placed it on my back between my shoulders. He then said: Act as an Imam for your people. He who acts as Imam of the people, he must be brief, for among them are the aged, among them are the sick, among them are the weak, and among them are the people who have business to attend. But when any of you prays alone, he may pray as he likes.

Sahih Muslim Book 4, Hadith 212 Next Hadith → The Apostle of Allah (ﷺ) used to be brief and perfect in prayer.

Sahih Muslim Book 4, Hadith 214