Charles Ellicott Commentary Exodus 6:26

"These are that Aaron and Moses, to whom Jehovah said, Bring out the children of Israel from the land of Egypt according to their hosts." — Exodus 6:26 (ASV)

Their armies. —This expression is applied here to the Israelites for the first time. It seems to refer to that organisation, of a quasi-military character, which was given to the people by the order of Moses during the long struggle with Pharaoh, and which enabled them at last to quit Egypt, not a disorderly mob, but “harnessed,” or “in military array” (Exodus 13:18). The expression is repeated in Exodus 7:4, Exodus 12:17, and Exodus 12:51.