As God shares His plan with Moses, He lets Moses know that Pharaoh would not let the people go when he would make the request. Even though Moses was being sent to make this special request, the numerous requests would never work. It was the mighty hand of God that would cause Pharaoh to release the people of Israel.
The “mighty hand” that “forces,” can be described as being “under compulsion.” God is saying that Pharaoh would not allow the people to go unless forced to do this at some point. Imagine being Moses. Imagine the request from God—to go and speak to Pharaoh with a promise that he would not listen. Doesn’t it seem crazy? Go ask this person to say “yes,” but understand he will always say, “no.”
If you are told that what you do will not be successful on your part, would you still do it? Would you be satisfied knowing that the mighty hand of God was going to handle it? Why would Moses even be needed at all if God’s strength was going to be what changed Pharaoh’s mind? All this points back to the glory of God. Remember, this was God’s power on display. Moses showed up and was used as a vessel, but at the end of the day, it was the mighty hand of God that caused Pharaoh to release His special people.
“But I know that the king of Egypt will not let you go unless a mighty hand forces him.” – Exodus 3:19 [NLT]