The king stubbornly refused to set us free, so the LORD killed the first-born male of every animal and the first-born son of every Egyptian family. This is why we sacrifice to the LORD every first-born male of every animal and save every first-born son."
On the way the LORD said to Moses: When you get to Egypt, go to the king and work the miracles I have shown you. But I will make him so stubborn that he will refuse to let my people go.
The LORD God told Moses: Soon you will see what I will do to the king. Because of my mighty power, he will let my people go, and he will even chase them out of his country.