sha·ha·da or sha·ha·dah 
(shə-hädə)
(shə-hädə)n.
The central statement of faith in Islam, recited ceremonially by new converts and consisting of an affirmation of the uniqueness of God and of Muhammad as God's prophet.
[Arabic šahāda, a witnessing, testimony, shahada, from šahida, to bear witness, testify, confirm; akin to Aramaic səhed, to bear witness.]