Kalimatus-shahadah, also known as the declaration of faith, is the key to enter Islam. It is the statement that affirms the oneness of Allah (God) and the prophethood of Muhammad (SAW). The statement is, "There is no God but Allah, and Muhammad is the Messenger of Allah." By reciting this statement with sincerity and conviction, a person becomes a Muslim.
The Kalimatus-shahadah is the first pillar of Islam and is considered the most important testimony of faith in the religion. It serves as the foundation of all other practices and beliefs in Islam. By declaring the oneness of Allah and the prophethood of Muhammad, a Muslim acknowledges the authority of Allah and accepts the guidance of His Prophet.
In summary, Kalimatus-shahadah is the declaration of faith that affirms the oneness of Allah and the prophethood of Muhammad. By reciting this statement, a person enters the religion of Islam and acknowledges the authority of Allah and the guidance of His Prophet.