Moses requested: Moses predicted that the plague would stop the next day. God also predicted that Pharaoh would refuse to listen (see 8:15).
These statements show an important truth. The ability to predict the future is central to God’s lordship (his rule and authority). God does not guess about what will happen. He knows what will happen.
God sees the future clearly. He also directs events according to his will. Because he knows and controls the future, he is truly the Lord.