1 And the Lord said unto Moses, Yet will I bring one plague more upon Pharaoh, and upon Egypt; afterwards he will let you go hence: when he shall let you go, he shall surely thrust you out hence altogether.
There was one more plague for Egypt, and this one followed a different pattern than any that came before. First, as discussed before, Pharaoh and his people would be given no warning of it, and no ultimatum to avoid it. It would fall on them without Moses and Aaron prophesying of it, yet they would know that it had come from the Lord, just the same.
And, because of this curse, Pharaoh would “thrust [Israel] out.” Every time before, Moses had gone to see if Pharaoh would let them leave, but this time Pharaoh would go to Moses. Pharaoh wouldn’t need any convincing, this time he would outright demand that the Lord’s demands be fulfilled, down to the smallest detail.
Another difference that we will see with this plague is that Moses does not raise his staff or his hand or do anything else to signal its arrival. This one comes entirely from the unseen world, a curse that is prepared, triggered, and executed by God alone.
In short, yet another plague, seemingly just a continuation of all that came before, but already this one was being set apart from all the rest. Something familiar, yet totally new.