'First born' in the Bible

And the sons of Reuben, Israel's first-born -- their births, by their families, by the house of their fathers, in the number of names, by their polls, every male from a son of twenty years and upward, every one going out to the host --

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

'And I, lo, I have taken the Levites from the midst of the sons of Israel instead of every first-born opening a womb among the sons of Israel, and the Levites have been Mine;

for Mine is every first-born, in the day of My smiting every first-born in the land of Egypt I have sanctified to Myself every first-born in Israel, from man unto beast; Mine they are; I am Jehovah.'

And Jehovah saith unto Moses, 'Number every first-born male of the sons of Israel from a son of a month and upward, and take up the number of their names;

and thou hast taken the Levites for Me (I am Jehovah), instead of every first-born among the sons of Israel, and the cattle of the Levites instead of every firstling among the cattle of the sons of Israel.'

And Moses numbereth, as Jehovah hath commanded him, all the first-born among the sons of Israel.

And all the first-born -- male -- by the number of names, from a son of a month and upward, of their numbered ones, are two and twenty thousand two hundred and seventy and three.

Take the Levites instead of every first-born among the sons of Israel, and the cattle of the Levites instead of their cattle; and the Levites have been Mine; I am Jehovah.

And from those ransomed of the two hundred and seventy and three (who are more than the Levites) of the first-born of the sons of Israel,

from the first-born of the sons of Israel he hath taken the money, a thousand and three hundred and sixty and five -- by the shekel of the sanctuary;

For they are certainly given to Me out of the midst of the sons of Israel, instead of him who openeth any womb -- the first-born of all -- from the sons of Israel I have taken them to Myself;

for Mine is every first-born among the sons of Israel, among man and among beast; in the day of my smiting every first-born in the land of Egypt I sanctified them for Myself;

and I take the Levites instead of every first-born among the sons of Israel:

every one opening a womb of all flesh which they bring near to Jehovah, among man and among beast, is thine; only, thou dost certainly ransom the first-born of man, and the firstling of the unclean beast thou dost ransom.

Reuben, first-born of Israel -- sons of Reuben: of Hanoch is the family of the Hanochite; of Pallu the family of the Palluite;

and the Egyptians are burying those whom Jehovah hath smitten among them, every first-born, and on their gods hath Jehovah done judgments --