And the LORD said unto Moses, “Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might shew these my signs before him: and that thou mayest tell in the ears of thy son, and of thy son’s son, what things I have wrought in Egypt, and My signs which I have done among them; that ye may know how that I am the LORD.”
Exodus 10:1-2

The people who descended from Abraham, Isaac, and Jacob who had received promise from God that the land of Canaan was theirs have been in Egypt for about four hundred [400] years. Most of that time they have been slaves in the land they had gone to for aid during a very severe famine.

The people were laboring hard for their captors, building great pieces of architecture for them. According to the first chapter of Exodus they became slaves because a new king in Egypt did not know of Joseph, and greatly feared that these people could rise up against the nation, and conquer them.

There is a phrase in the verses above that is quite common through out the Scriptures. That phrase is, “…That you may know that I am the LORD.” The prophet Ezekiel uses the phrase at least sixty six [66] times. Here is Exodus it has been used three times at least referring to Egypt “that they may know that I am the LORD.” That gives me a lot of assurance that God desires the world to know that He is the LORD; and the One and only.

God speaking to and through Moses is assuring Moses and the people that what He is doing with these wonderful signs, judgment on Egypt is so that they too will know that He is the LORD.

God has shown us quite clearly in His word, in His love, mercy, and grace through the cross of our Lord and Savior Jesus Christ that He is the LORD. Jesus  the One who is the God-Man; fully God and fully Man, had no sin, and was completely faithful to God His Father when He became flesh and dwelt among us (John 1:1-4, 14). He was fully qualified to be our propitiation for sin. He bore the wrath of God for us in His death, He was buried, and having paid our sin debt He arose and came out of the grave alive forever more. That we might know that He is the LORD.