(a) It is narrated from Sayyiduna Abu Mahdhurah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) ordered about twenty men to give the adhan, and the voice of Sayyiduna Abu Mahdhurah (may Allah be pleased with him) pleased him (peace and blessings be upon him), so he (peace and blessings be upon him) said: "Say: '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, hayya 'ala al-salah, hayya 'ala al-salah, hayya 'ala al-falah, hayya 'ala al-falah, Allahu akbar, Allahu akbar, la ilaha illallah' (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, come to prayer, come to prayer, come to success, come to success, Allah is the Greatest, Allah is the Greatest, there is no god but Allah)." And the iqamah is likewise.
(b) He narrated it thus. There is agreement that, when the adhan is with tarji', the iqamah is not like the adhan in the number of its words; this shows that what is meant is the kind of words, and that this explanation came from some of the narrators.
(c) Hisham al-Dastuwa'i narrated this hadith from Amir al-Ahwal without mentioning the iqamah in it, and that portion is what Muslim recorded in his Sahih; perhaps he left out the narration of Hammam bin Yahya because of doubt about the chain of the iqamah mentioned in it. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1969