The Shahada (Arabic: الشَّهَادَةُ aš-šahādatu; Arabic pronunciation: [aʃʃahaːdatʊ], 'the testimony'), also transliterated as Shahadah, is an Islamic oath and creed, and one of the Five Pillars of Islam and part of the Adhan. It reads: "I bear witness that there is no god worthy of worship but God, and I bear witness that Muhammad is the Messenger of God." The Shahada declares belief in the oneness (tawhid) of God and the acceptance of Muhammad as God's messenger. Some Shia Muslims also include a statement of belief in the wilayat of Ali, but they do not consider it as an obligatory part for converting to Islam. A single honest recitation of the Shahada is all that is required for a person to become a Muslim according to most traditional schools.

The declaration reads:

لَا إِلَٰهَ إِلَّا ٱللَّٰهُ‎

lit. 'There is no deity worthy of worship but God'

مُحَمَّدٌ رَسُولُ ٱللَّٰهِ‎

lit. 'Muhammad is the Messenger of God'

The above two statements are commonly prefaced by the phrase ašhadu ʾan (lit. 'I bear witness that'), yielding the full form:

أَشْهَدُ أَلَّا إِلَه إِلَّا اللَّه، وَأَشْهَدُ أَنْ مُحَمَّدًا رَسُولُ اللَّه‎