Sahih Muslim Book 4, Hadith Number 1258.

Chapter : Desirability of going to prayer with dignity and tranquillity and forbiddance of going to it in hot haste.

Abu Salama reported on the authority of Abu Huraira that when Iqama was pronounced for the Messenger of Allah (may peace be upon him), the people occupied their places in the rows before the Apostle of Allah (way peace be upon him) stood up at his place.