First pilar of islam is Shahadah

Islam has five primary obligations, or pillars of faith, that each Muslim must fulfill in his or her lifetime. 

First pilar of islam is  Shahadah  or Believing in Allah and Holy Prophet Muhammad(P.B.U.H).

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 profession of faith, is the first pillar of Islam. Muslims bear witness to the oneness of God by reciting the creed "There is no God but God and Muhammad is the Messenger of God." This simple yet profound statement expresses a Muslim's complete acceptance of and total commitment to Islam.