Albert Barnes Commentary Micah 6:4

"For I brought thee up out of the land of Egypt, and redeemed thee out of the house of bondage; and I sent before thee Moses, Aaron, and Miriam." — Micah 6:4 (ASV)

For I brought you up out of the land of Egypt, and redeemed you out of the house of servants— What were you? What are you? Who made you what you are? God reminds them. They were slaves; they are His people in the heritage of the pagan, and that by His outstretched arm. God mentions some of the chief mercies He had shown them, when He had made them His people: His redemption of them from Egypt, His guidance through the wilderness, His leading them over the last difficulty to the promised land. The use of the familiar language of the Pentateuch is like the touching of so many keynotes, recalling the whole harmony of His love.

Moses, Aaron, and Miriam together, are Lawgiver, to deliver and instruct; Priest, to atone; and prophetess (Exodus 15:20) to praise God; and the name of Miriam at once recalled the mighty works at the Red Sea and how they then thanked God.