Sforno on Exodus 6:26/ספורנו על שמות ו׳:כ״ו

1הוא אהרן ומשה, repeated, seeing these two were the most honoured of their families and it was therefore they who were fit to be entrusted by G’d with the command: הוציאו את בני ישראל, seeing that their voices would be heeded by their compatriots, of all the various tribes.

2על צבאותם, the entire community including all their respective members, simultaneously.