(a) Sayyiduna Abu Mahdhurah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) taught him the adhan in nineteen phrases and the iqamah in seventeen. The adhan is: "'Allahu akbar, Allahu akbar, Allahu akbar, Allahu akbar, ashhadu an la ilaha illallah, ashhadu an la ilaha illallah, ashhadu anna Muhammadan rasulullah, ashhadu anna Muhammadan rasulullah, ashhadu an la ilaha illallah, ashhadu an la ilaha illallah, ashhadu anna Muhammadan rasulullah, ashhadu anna Muhammadan rasulullah' (Allah is the Greatest, Allah is the Greatest, Allah is the Greatest, Allah is the Greatest, I bear witness that there is no god but Allah, I bear witness that there is no god but 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 god but Allah, I bear witness that there is no god but Allah, I bear witness that Muhammad is the Messenger of Allah, I bear witness that Muhammad is the Messenger of Allah), 'Hayya 'ala al-salah' (Come to prayer) twice, 'Hayya 'ala al-falah' (Come to success) twice, 'Allahu akbar, Allahu akbar, la ilaha illallah' (Allah is the Greatest, Allah is the Greatest, there is no god but Allah)" and the iqamah twice each.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1968