God is already calling them, "My people." What had they done? Had they pledged themselves to God? Had they repented? They had not done a thing yet, and God is already calling them His own.
Does He have a similar feeling of possessiveness toward those that He is going to deal with in terms of salvation? Definitely! "They are Mine!" What will He do for His own? Who will hold back the hand of God? Nobody, and that is the story. Israel got out of Egypt because God set His mind to do it. He said, "I have chosen them, and they are Mine" and they had not done a thing yet. In fact, it would be weeks before they even knew that Moses existed anymore than just what they had heard about what occurred forty years before.
There is no indication that Moses had any contact with anybody in Egypt during those forty years. He was not sending letters every couple of weeks saying, "Get ready—I am just about to return now." No, he was in the wilderness learning what it is like to be a shepherd, tending sheep, because he was going to pastor a whole nation of millions of people. He was getting his attitude straightened out. God had sent him to school to prepare. The wilderness was the school of hard knocks for someone like Moses who had been reared in a cushy palace. God probably had to knock a great deal of pride, vanity, and cockiness out of him before He could use him.
Thus, the salvation of Israel was already underway. Who does the Bible say is in charge? Who does the Bible show to be the one who has the answers to their problems? Who took the initiative? Who is doing the leading? Who is doing the providing? Even at this point, we can see that God is the One doing all these things.
By the time they begin to realize that God is involved, we find that all they needed to do is to agree with what He wanted them to do, and He would do the work to bring them out of Egypt.
John W. Ritenbaugh
Unleavened Bread and Pentecost