Its in Isaiah 63:9 that the phrase of the title is used. The phrase describes Gods persona which accompanied the people of Israel throughout the journey. God isn’t an angel, but the word was used by the ancients to describe theophany. The term ” the angel of the Lord ” appears about sixty times, making a reference to the pre- incarnate appearance of Christ. Here the word ”Angel” is capitalized. It is from the Hebrew word ” malawk ”, which sometimes is used of God. It is significant that in that entire journey God went with them. When Moses struck the rock, God was standing there. When they were to cross the red sea, God was there as a pillar of fire. Gods concern was to keep them safe and to bring them in to their prepared place. Christ Jesus serves as the climax of Gods presence in history. Jesus came as Gods messenger. Instructions on his to relate to this Angel reads into the next four verses. They were to obey and not provoke the Angel. It was the duty of the Angel to bring them in to the land occupied by six different enemies. There’s a blessing waiting for you, no matter the enemy. Be conscious of God’s presence. He it is taking you into the blessing. No amount ”ites” will stand against your entry. Each of those enemies represent what we must overcome to enter in; but that is the story for another day.
Behold, I send an Angel before thee, to keep thee in the way, and to bring thee into the place which I have prepared. Exodus 23:20 KJV