So Moses and Aaron did all these wonders before Pharaoh, and the Lord hardened Pharaoh’s heart, and he would not let the Israelites go out of his land.
And when Pharaoh stubbornly refused to let us go, the Lord killed all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast. Therefore, I sacrifice to the Lord the first male offspring of every womb, but all the firstborn of my sons I redeem.’
The Lord said to Moses, “When you go to return into Egypt, see that you do all those wonders before Pharaoh, which I have put in your hand, but I will harden his heart, so that he shall not let the people go.
Then the Lord said to Moses, “Now you shall see what I will do to Pharaoh, for with a strong hand shall he let them go, and with a strong hand shall he drive them out of his land.”
Pharaoh said, “I will let you go, that you may sacrifice to the Lord your God in the wilderness. Only you shall not go very far away. Make entreaty for me.”
And Pharaoh sent, and behold, not one of the livestock of the Israelites was dead. But the heart of Pharaoh was hardened, so that he did not let the people go.