John Calvin 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)

These are the Aaron and Moses. It is not without reason that Moses so often reasserts that their office was assigned to him and his brother by God's command: that the Israelites might perceive they were rescued from their deep abyss by divine grace; that their minds might be recalled to God’s ancient covenant and they might acknowledge that their fathers’ hope was not in vain; and finally, that they might hereafter completely devote themselves to God. There also seems to be an indirect antithesis between the armies of the people and two vile and abject men. For they would have been far from able to bear such a weighty burden, unless God had exceeded all their hopes by working miraculously by their hands. Therefore, the Spirit magnifies this grace elsewhere: that God

led his people, like a flock, by the hand of Moses and Aaron (Psalms 77:20).

For what could be less probable than that a great multitude, which would make up many nations, should obey the commands of two men, be ruled by their counsel, and be gathered into one place by their efforts, in order to migrate into another land against the will of a very powerful king? For what was their united authority to command twelve armies, separated into their separate battalions?

What no earthly kings, with all their power and wisdom, their terror, and their threats, could achieve, God performed through two unwarlike men, neither experienced nor renowned, when Moses himself, alarmed by the magnitude of the work, often resisted the commission entrusted to him. For, at the end of this chapter, he again repeats his excuse that he was not eloquent but was of hesitating and embarrassed speech.

This, then, is the point to which all this leads: namely, to assign to God the praise of His loving-kindness and to heighten His glory. There is some ambiguity in verse 28, for it might be read separately with the meaning that “God not only spoke in the wilderness of Midian, to set Moses over the people in their deliverance, but also in Egypt after some time had passed.” Thus, “on the day” would mean “after some time.” However, it seems better to me to read the three verses in connection with each other.