The Shahada (ٱلشَّهَادَةُ) is the Arabic term for the declaration of faith in one God (Allah) and His messenger.
Arabic: أَشْهَدُ أَنْ لَا إِلَٰهَ إِلَّا ٱللَّٰهُ وَأَشْهَدُ أَنَّ مُحَمَّدًا رَسُولُ ٱللَّٰهِ
Transliteration: Ashadu an la ilaha illa illa-ilah, wa ashadu anna muhammadan rasul ullah
Translation: I bear witness there is no God but God [Allah – i.e. there is none worthy of worship but Allah], and I bear witness that Muhammad is the Messenger of Allah
The Shahada is the most sacred statement in Islam, and must be recited with full understanding and mindfulness of its meaning.
The belief in one Allah is the central tenet of the Islamic faith, around which all else revolves. Muslims are continuously reminded of this foundational belief, in the recital of the Shahada during each of the five daily prayers, as well as many more pivotal moments of a Muslim’s life.
The second part of the Shahada requires Muslims to acknowledge and testify to the belief in the Prophet Muhammad (peace be upon him) as Allah’s messenger. This serves as a reminder to Muslims of the importance of the Prophet Muhammad (peace be upon him), but also as a reminder to never associate partners with Allah, for Muhammad (peace be upon him) is just a messenger, and Allah remains one God alone.