Sahih Muslim Book 4, Hadith Number 1255.

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

Abu Qatada reported: The Messenger of Allah (may peace be upon him) said: When the Iqama is pronounced do not get up till you see me Ibn Hatim was in doubt whether it was said: “When the Iqama is pronounced” or “When call is made”.