Commentary for Exodus 6:11

!בא דבר אל פרעה, “go and speak sternly to Pharaoh!” G-d implies that He will go with Moses on this mission. On the other hand, at the time when Moses is bidden to go outside instead of into the city, G-d uses the term: לך, [as when G-d instructed Avraham to leave Charan and to go to a land which He would show him (Genesis 12,1). Ed.], as in Exodus 7,15 where G-d is told to speak to Pharaoh at the banks of the Nile.