Yehovah knew that it would take something greater than human power to move Pharaoh to let the Yisra’elites go. The Complete Jewish Bible translation “with a mighty hand” was a common saying or expression meaning “by force.” Yehovah had promised Moshe that He would force Pharaoh to let the Israelites go—not just for a three-day festival at some mountain 3 days’ journey away, but he would “drive them out of his country.” What God was planning for and reassuring Moses about was nothing less than the full exodus.