Where did the shahadah come from?

The Shahadah, the Islamic declaration of faith, originates from the teachings and practices established by the Prophet Muhammad in the 7th century CE. It states, "There is no god but Allah, and Muhammad is the Messenger of Allah," encapsulating the core belief in monotheism and the prophethood of Muhammad. The phrase is rooted in the Quran and hadith, serving as a fundamental component of Islamic faith and identity. It is recited by Muslims during prayers and is a key aspect of conversion to Islam.