NET

15 When Pharaoh stubbornly refused to release us, the Lord killed all the firstborn in the land of Egypt, from the firstborn of people to the firstborn of animals. That is why I am sacrificing to the Lord the first male offspring of every womb, but all my firstborn sons I redeem.’

Darby

15 And it came to pass, when Pharaoh stubbornly refused^D494 to let us go, that Jehovah slew all the firstborn in the land of Egypt, both the firstborn of men and the firstborn of cattle: therefore I sacrifice to Jehovah all that breaketh open the womb being males; and every firstborn of my children I ransom.

Darby Bible Notes

refused - Strictly, 'stiffened [his neck, or heart].'

KJV

15 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.

Strong's

15 And it came to pass, when Pharaoh^H6547 would hardly^H7185 let us go^H7971, that the LORD^H3068 slew^H2026 all the firstborn^H1060 in the land^H776 of Egypt^H4714, both the firstborn^H1060 of man^H120, and the firstborn^H1060 of beast^H929: therefore I sacrifice^H2076 to the LORD^H3068 all that openeth^H6363 the matrix^H7358, being males^H2145; but all the firstborn^H1060 of my children^H1121 I redeem^H6299.