Final answer:
The prophet Moses warned the Egyptians of plagues if they did not let the Israelites return to the Promised Land.
Explanation:
Moses was the prophet who warned the Egyptians that plagues would come if they did not allow the Israelites to return to the Promised Land. According to the Hebrew Bible, the Egyptian Pharaoh finally relented after facing divine punishments, including the death of all first-born in Egypt.
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