King James Version
And it came to pass, when Pharaoh would hardly let us go, that the LORD slew all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of beast: therefore I sacrifice to the LORD all that openeth the matrix, being males; but all the firstborn of my children I redeem.New International Version
When Pharaoh stubbornly refused to let us go, the LORD killed every firstborn in Egypt, both man and animal. This is why I sacrifice to the LORD the first male offspring of every womb and redeem each of my firstborn sons.'Catholic Public Domain Version
For when Pharaoh had been hardened and was unwilling to release us, the Lord killed every firstborn in the land of Egypt, from the firstborn of man, even to the firstborn of beasts. For this reason, I immolate to the Lord all of the male sex that opens the womb, and all the firstborn of my sons I redeem.