Exodus 10:7-9

7Pharaoh’s officials said to him, “How long will this man be a snare to us? Let the people go, so that they may worship the LORD their God. Do you not yet realize that Egypt is ruined?”

8Then Moses and Aaron were brought back to Pharaoh. “Go, worship the LORD your God,” he said. “But tell me who will be going.”

9Moses answered, “We will go with our young and our old, with our sons and our daughters, and with our flocks and herds, because we are to celebrate a festival to the LORD .”