the Messenger of Allah said: "When one of you comes to the Salat and (finds) the Imam is in a position, then do as the Imam is doing."
Jami` at-Tirmidhi Book 6, Hadith 48
← Previous Hadith "I asked the Messenger of Allah about looking around during the Salat. He said: 'It is a portion which the Shaitan snatches during a man's prayer.'"

Jami` at-Tirmidhi Book 6, Hadith 47 Next Hadith → the Messenger of Allah said: "When the Iqamah is called for the prayer, then do not stand until you see that I have come out."

Jami` at-Tirmidhi Book 6, Hadith 49