The Pharaoh ruled the Land of Egypt. People who are slaves have no freedom. People who are slaves cannot sing the songs they like. They cannot play their favorite games. They have no time to rest.
Slavery is very cruel.
Moses was a young, brave and kind person. He saw that the Hebrew people were suffering. Moses was proud that he was a Hebrew. He knew that slavery was wrong. Moses felt it was a crime to take away a person's freedom.