Read Exodus 8:10 Using Other Translations
And he said, To morrow. And he said, Be it according to thy word: that thou mayest know that there is none like unto the LORD our God.
And he said, "Tomorrow." Moses said, "Be it as you say, so that you may know that there is no one like the LORD our God.
“Do it tomorrow,” Pharaoh said. “All right,” Moses replied, “it will be as you have said. Then you will know that there is no one like the LORD our God.