Exodus 11:1 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.
[Patriarchs & Prophets pp 273] When the demand for Israel's release had been first presented to the king of Egypt, the warning of the most terrible of the plagues had been given. Moses was directed to say to Pharaoh, “Thus saith the Lord, Israel is My son, even My first-born: and I say unto thee, Let My son go, that he may serve Me: and if thou refuse to let him go, behold, I will slay thy son, even thy first-born.” Exodus 4:22, 23. Though despised by the Egyptians, the Israelites had been honored by God, in that they were singled out to be the depositaries of His law.
In the special blessings and privileges accorded them, they had pre-eminence among the nations, as the first-born son had among brothers. The judgment of which Egypt had first been warned, was to be the last visited. God is long-suffering and plenteous in mercy. He has a tender care for the beings formed in His image. If the loss of their harvests and their flocks and herds had brought Egypt to repentance, the children would not have been smitten; but the nation had stubbornly resisted the divine command, and now the final blow was about to fall.
Moses had been forbidden, on pain of death, to appear again in Pharaoh's presence; but a last message from God was to be delivered to the rebellious monarch, and again Moses came before him, with the terrible announcement: “Thus saith the Lord, About midnight will I go out into the midst of Egypt: and all the first-born in the land of Egypt shall die, from the first-born of Pharaoh that sitteth upon his throne, even unto the first-born of the maidservant that is behind the mill; and all the first-born of beasts.
Exodus 11:6 And there shall be a great cry throughout all the land of Egypt, such as there was none like it, nor shall be like it any more. 7 But against any of the children of Israel shall not a dog move his tongue, against man or beast: that ye may know how that the Lord doth put a difference between the Egyptians and Israel.
May God add His blessing to the study of His word. “Good night” and God bless!