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.