Which event marked the beginning of monotheism in the Christian and Jewish traditions?

The beginning of monotheism in the Christian and Jewish traditions is often traced back to the covenant between God and Abraham, as described in the Hebrew Bible. This pivotal moment established the belief in a single, all-powerful God who is the creator and sustainer of the universe. This foundational concept was further developed in the teachings of Moses and the prophetic traditions, solidifying the idea of monotheism in Judaism. In Christianity, monotheism is also central, with the belief in one God expressed through the doctrine of the Trinity.