Hadith 40085

Abu Mahdhurah reported; I said; Messenger of Allah, teach me the method of ADHAN (how to pronounce the call to prayer). He wiped my forehead (with his hand) and asked me to pronounce; Allah is most great. Allah is most great. Allah is most great. Allah is most great, raising your voice while saying them (these words). Then you must raise your voice in making the testimony:
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. Lowering your voice while saying them (these words). Then you must raise your voice in making the testimony: I testify that there is no god but Allah, I testify there is no god but Allah; I testify Muhammad is the Messenger of Allah, I testify Muhammad is the Messenger of Allah. Come to prayer, come to prayer; come to salvation, come to salvation. If it is the morning prayer, you must pronounce; prayer is better than sleep, prayer is better than sleep, Allah is most great; there is no god but Allah.