Chapter 19 is the “seam” of the book of Exodus. All that came before hinges on this chapter where God tells the Jews what he’s commissioned them for, to be a “kingdom of priests,” healers of the His good world. Here we learn what it looks like for God’s people to be called to be holy.
Exodus 16:1-15, 22-26
The Hebrews were doing more than “complaining” when Exodus describes their “grumbling.” They were expressing their addiction to the Egyptian way of life. But God soothes their cravings with bread from heaven.