The night of the tenth plague was a night of striking (vv 29-36) and a night of keeping (vv 37-42). During this night of striking, we see that the firstborn died, that Pharaoh was done, that the Egyptians were desperate, that Egypt was defeated, and that this was all deserved. During this night of keeping there was a promise fulfilled, a parable fulfilled, and a prophecy fulfilled. And then there was an obligation to be fulfilled.