أَخْبَرَنَا بِشْرُ بْنُ مُعَاذٍ، قَالَ حَدَّثَنِي إِبْرَاهِيمُ، - وَهُوَ ابْنُ عَبْدِ الْعَزِيزِ بْنِ عَبْدِ الْمَلِكِ بْنِ أَبِي مَحْذُورَةَ - قَالَ حَدَّثَنِي أَبِي عَبْدُ الْعَزِيزِ، وَجَدِّي عَبْدُ الْمَلِكِ، عَنْ أَبِي مَحْذُورَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم أَقْعَدَهُ فَأَلْقَى عَلَيْهِ الأَذَانَ حَرْفًا حَرْفًا قَالَ إِبْرَاهِيمُ هُوَ مِثْلُ أَذَانِنَا هَذَا ‏.‏ قُلْتُ لَهُ أَعِدْ عَلَىَّ ‏.‏ قَالَ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ مَرَّتَيْنِ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ مَرَّتَيْنِ ثُمَّ قَالَ - بِصَوْتٍ دُونَ ذَلِكَ الصَّوْتِ يُسْمِعُ مَنْ حَوْلَهُ - أَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ مَرَّتَيْنِ أَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ اللَّهِ مَرَّتَيْنِ حَىَّ عَلَى الصَّلاَةِ مَرَّتَيْنِ حَىَّ عَلَى الْفَلاَحِ مَرَّتَيْنِ اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ لاَ إِلَهَ إِلاَّ اللَّهُ ‏.‏

It was narrated from Abu Mahdhurah that the Prophet (PBUH) sat him down and taught him the Adhan letter by letter. (One of the narrators) Ibrahim said, "It is like this Adhan of ours". I said[1]: "Recite it to me." He said, "Allahu Akbar, Allahu Akbar (Allah is the greatest, Allah is the greatest), Ashhadu an la ilaha illallah (I bear witness that there is none worthy of worship except Allah) - twice. Ashhadu anna Muhammadan Rasulallah (I bear witness that Muhammad is the messenger of Allah) - twice. Then he said in a lower voice which those around him could here: Ashhadu an la ilaha ill-Allah (I bear witness that there is none worthy of worship except Allah) - twice. Ashhadu anna Muhammadan Rasulallah (I bear witness that Muhammad is the messenger of Allah) - twice, Hayya'ala as-salah (come to prayer) - twice, Hayya alal-falah (come to prosperity) - twice, Allahu Akbar Allahu Akbar la ilaha illallah (Allah is the Greatest, Allah is the Greatest, there is none worthy of worship except Allah). [1] Bishir bin Mu'adh who heard it from Ibrahim, and from whom An-Nasa'i is reporting it, is the one who is asking for the Adhan to be recited to him. Translation Not Available

Book reference: Sunan An Nisai Book 7 Hadith 636
Web reference: Sunan An Nisai Volume 1 Book 7 Hadith 630