'First born' in the Bible

and thou hast said unto Pharaoh, Thus said Jehovah, My son, My first-born is Israel,

and I say unto thee, Send away My son, and he doth serve Me; and -- thou dost refuse to send him away -- lo, I am slaying thy son, thy first-born.'

These are heads of the house of their fathers: Sons of Reuben first-born of Israel are Hanoch, and Phallu, Hezron, and Carmi: these are families of Reuben.

and every first-born in the land of Egypt hath died, from the first-born of Pharaoh who is sitting on his throne, unto the first-born of the maid-servant who is behind the millstones, and all the first-born of beasts;

and I have passed over through the land of Egypt during this night, and have smitten every first-born in the land of Egypt, from man even unto beast, and on all the gods of Egypt I do judgments; I am Jehovah.

And it cometh to pass, at midnight, that Jehovah hath smitten every first-born in the land of Egypt, from the first-born of Pharaoh who is sitting on his throne, unto the first-born of the captive who is in the prison-house, and every first-born of beasts.

Sanctify to Me every first-born, opening any womb among the sons of Israel, among man and among beast; it is Mine.'

And every firstling of an ass thou dost ransom with a lamb, and if thou dost not ransom it, then thou hast beheaded it: and every first-born of man among thy sons thou dost ransom.

yea, it cometh to pass, when Pharaoh hath been pained to send us away, that Jehovah doth slay every first-born in the land of Egypt, from the first-born of man even unto the first-born of beast; therefore I am sacrificing to Jehovah all opening a womb who are males, and every first-born of my sons I ransom;

'Thy fulness and thy liquids thou dost not delay; the first-born of thy sons thou dost give to Me;

and the firstling of an ass thou dost ransom with a lamb; and if thou dost not ransom, then thou hast beheaded it; every first-born of thy sons thou dost ransom, and they do not appear before Me empty.