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The testimony of faith is saying with conviction, “La ilaha illa Allah, Muhammadur rasoolu Allah.” This saying means “There is no true god (deity) but God (Allah),1 and Muhammad is the Messenger (Prophet) of God.” The first part, “There is no true god but God,” means that none has the right to be worshipped but God alone, and that God has neither partner nor son. This testimony of faith is called the Shahada, a simple formula which should be said with conviction in order to convert to Islam (as explained previously on this page). The testimony of faith is the most important pillar of Islam.
Guide – Islam