(Ashhadu aina) lā ilāha illā Allāh
wa-Muḥammad rasūl Allāh
(I bear witness that) there is no god but God and Muḥammad is the messenger of God.
The shahāda is included in the ādhān (call to prayer) and is pronounced during the ṣalāt, as part of the tashahhud, which, however, contains extra phrases.
"Shahāda." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (December 12, 2017). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/shahada
"Shahāda." The Concise Oxford Dictionary of World Religions. . Retrieved December 12, 2017 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/shahada