The following is the Shar'i formula of the verbal assertion ( Iqraar-bil-Lisaan ) of Imaan :

There is no God but Allah. Muhammad is the Rasool of Allah.
This is Imaan or Islaam in a nutshell in the concise form. The affirmation by the heart of this concise or brief formula (known as Kalimah Tayyibah ) and its verbal assertion render the person a Mu'min or a Muslim.
Since this brief Kalimah or statement is a comprehensive, allembracing and multidimensional conception and not an undefined and ambiguous concept, the Shari'ah makes imperative the acceptance of Allah and the Rasool – the two fundamental constituents stated in the concise formula – in the defined and restricted form elaborated by Rasoolullah (SAW). Any meaning or interpretation short of the Shar'i concept of Tasdeeq is neither Imaan nor Islaam .