The Book of Prayers
Ṣaḥīḥ Muslim 842
اللَّهُ أَكْبَرُ اللَّهُ أَكْبَرُ لاَ إِلَهَ إِلاَّ اللَّهُ
Allāh akbaru-Llāh akbaru lā ilaha illā-Llāh
Transliteration generated from the Arabic vowel marks
The full narration
Abu Mahdhura said that the Messenger of Allah (ﷺ) taught him Adhan like this:Allah is the Greatest, Allah is the Greatest; I testify that there is no god but Allah, I testify that there is no god but Allah; I testify that Muhammad Is the Messenger of Allah, I testify that Muhammad is the Messenger of Allah, and it should be again repeated: I testify that there is no god but Allah, I testify that there is no god but Allah; I testify that Muhammad Is the Messenger of Allah, I testify that Muhammad is the Messenger of Allah. Come to the prayer (twice). Come to success (twice). Ishaq added: Allah is the Greatest, Allah is the Greatest; there Is no god but Allah
Source
Ṣaḥīḥ Muslim · 842
- Agreed upon as authentic (al-Bukhārī / Muslim)