Moses' brother is Aaron, a significant figure in the Hebrew Bible. He served as a spokesperson for Moses and played a crucial role in leading the Israelites out of Egypt. Aaron was appointed as the first high priest, establishing the priestly lineage for the Israelites. Aaron is known for his ability to communicate effectively, which complemented Moses' leadership. He assisted in performing miracles, such as turning his staff into a serpent, and helped convey God's messages to the people. Aaron's contributions were vital during the Exodus and in the establishment of religious practices among the Israelites.