It is narrated from Sayyiduna Abu Mahdhurah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) taught him the adhan in nineteen phrases and the iqamah in seventeen phrases. The adhan is: Allah is the Greatest, Allah is the Greatest, Allah is the Greatest, Allah is the Greatest; I bear witness that there is no true god except Allah, I bear witness that there is no true god except Allah; I bear witness that Muhammad is the Messenger of Allah, I bear witness that Muhammad is the Messenger of Allah; I bear witness that there is no true god except Allah, I bear witness that there is no true god except Allah; I bear witness that Muhammad is the Messenger of Allah, I bear witness that Muhammad is the Messenger of Allah; come to the prayer, come to the prayer; come to success, come to success; Allah is the Greatest, Allah is the Greatest; there is no true god except Allah. And the iqamah was said with its phrases repeated in pairs.
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6698