'First born' in the Bible

and all the firstborn in the land of Egypt shall die: even from the firstborn of Pharaoh that sitteth on his seat, unto the firstborn of the maidservant that is in the mill, and all the firstborn of the cattle.

"For I will go about in the land of Egypt this same night, and will smite all the firstborn in the land of Egypt, both of man and beast, and upon all the gods of Egypt will I the LORD do execution.

And at midnight the LORD smote all the firstborn in the land of Egypt: from the firstborn of Pharaoh that sat on his seat, unto the firstborn of the captive that was in prison, and all firstborn of the cattle.

"Sanctify unto me all the firstborn that open all manner matrices among the children of Israel, as well of men as of beasts: for they are mine."

then thou shalt appoint unto the LORD all that openeth the matrix, and all the firstborn among the beasts which thou hast if they be males.

And all the firstborn of the asses, thou shalt redeem with a sheep: if thou redeem him not, then break his neck. But all the firstborn among thy children shalt thou buy out.

And when Pharaoh was loath to let us go, the LORD slew all the firstborn in the land of Egypt: as well the firstborn of men as of beasts. And therefore I sacrifice unto the LORD all the males that open the matrix, but all the firstborn of my children I must redeem.'

Thy fruits, whether they be dry or moist, see thou keep not back. Thy firstborn son thou shalt give me:

But the first of the ass thou shalt buy out with a sheep, or if thou redeem him not: see thou break his neck. All the firstborn of thy sons thou must needs redeem. And see that no man appear before me empty.