and when Pharaoh refused to let us go, Adonai slew all the firstborn in the land of Egypt, both men and animals. So I sacrifice to Adonai all firstborn males, but I redeem the firstborn of my sons.’
Adonai said to Moses, “When you go back to Egypt, see that you do all the wonders before Pharaoh that I have put in your hand. Still, I will harden his heart, and he will not let the people go.
Adonai said to Moses, “Now you will see what I am going to do to Pharaoh. By way of a strong hand he will let them go, and drive them out of his land.”
When Pharaoh inquired, there was not so much as one of the cattle of Bnei-Yisrael dead. But the heart of Pharaoh was stubborn, and he did not let the people go.