The Ethiopian woman] Heb. 'the Cushite woman.' This can hardly be Zipporah, who was a Midianite (Exodus 2:16; Exodus 2:21). Moses, it appears, had married again. Marriage with the Canaanites was forbidden (Exodus 34:16), but not with the Egyptians (see Deuteronomy 23:7-8).
Related Commentaries of Numbers 12:1
Numbers 12:1
1 And Miriam and Aaron spake against Moses because of the Ethiopiana woman whom he had married: for he had married an Ethiopian woman.