Aaron was the older brother of Moses and his closest ally and companion during their journey of leading the Israelites out of slavery in Egypt. In the Bible, Aaron is often referred to as Moses' "spokesperson" or "mouthpiece" because he helped Moses communicate with the Israelites and Pharaoh. Aaron played a key role in many of the miracles that God performed through Moses, such as turning the Nile River into blood and bringing plagues upon Egypt. Aaron was also appointed by God to serve as the first high priest of Israel, responsible for leading the people in worship and performing sacrifices for their sins. Overall, Aaron was not only Moses' brother but also his partner in the mission of liberating and leading the Israelites to the Promised Land.