'First born' in the Bible

And these are the names of the sons of Aaron; Nadab the first-born, and Abihu, Eleazar, and Ithamar.

And I, behold, I have taken the Levites from among the children of Israel, instead of all the first-born that openeth the matrix among the children of Israel: therefore the Levites shall be mine;

Because all the first-born are mine; for on the day that I smote all the first-born in the land of Egypt, I hallowed to me all the first-born in Israel, both man and beast: mine they shall be: I am the LORD.

And the LORD said to Moses, number all the first-born of the males of the children of Israel, from a month old and upward, and take the number of their names.

And thou shalt take the Levites for me (I am the LORD) instead of all the first-born among the children of Israel; and the cattle of the Levites, instead of all the firstlings among the cattle of the children of Israel.

And Moses numbered, as the LORD commanded him, all the first-born among the children of Israel.

And all the first-born males by the number of names, from a month old and upward, of those that were numbered of them, were twenty and two thousand two hundred and seventy and three.

Take the Levites instead of all the first-born among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the LORD.

And for those that are to be redeemed of the two hundred and seventy and three, of the first-born of the children of Israel, which are more than the Levites:

Of the first-born of the children of Israel he took the money; a thousand three hundred and sixty and five shekels, after the shekel of the sanctuary.

For they are wholly given to me from among the children of Israel; instead of such as open every womb, even instead of the first-born of all the children of Israel, have I taken them to me.

For all the first born of the children of Israel are mine, both man and beast: on the day that I smote every first-born in the land of Egypt I sanctified them for myself.

And I have taken the Levites for all the first-born of the children of Israel.

Every thing that openeth the matrix in all flesh, which they bring to the LORD, whether of men or beast, shall be thine: nevertheless, the first born of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem.

For the Egyptians buried all their first-born, whom the LORD had smitten among them: upon their gods also the LORD executed judgments.