Three times (twice in this weekly portion of Va-Era) Moses brings up with God the issue of his speech impediment.
Moses, so it seems, lost at once his due special respect, if not the adulation the people gave him as their leader (see Exodus 14:31b), and they did not seek him out anymore.
Rather than owning up to his failed leadership by not standing up to the people, who had demanded the making of a golden calf to supersede Moses on the 40th day since his “disappearance”, Aaron blamed the people...
This Torah portion Tetsaveh is unique if only because it is the only portion in the Torah (since we have been introduced to Moses at the beginning of Exodus) where his name per se is absent...