The words incorporate the Shahāda (profession of faith):(i) Allāhu Akbar (God is most great)(ii) Ashhadu anna lā ilāha illā Allāh (I bear witness there is no god but God)(iii) Ashhadu anna Muḥammadan rasūl Allāh (I bear witness Muḥammad is the messenger of God)(iv) Ḥaiya ʿalā al-ṣalāt (Come to prayer)(v) Ḥaiya ʿalā al-falāḥ (Come to wellbeing)(vi) Al-ṣalāt khayrun min al-nawm (Prayer is better than sleep)(vii) Allāhu Akbar (God is most great)(viii) Lā ilāha illā Allāh (There is no god but God).
"Ādhān." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 17, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/adhan
"Ādhān." The Concise Oxford Dictionary of World Religions. . Retrieved August 17, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/adhan