'First born' in the Bible

And Canaan begat Zidon, his firstborn, and Heth,

The sons of Judah: Er and Onan, and Shelah: three were born to him from the daughter of Shua the Canaanitess. And Er the first-born of Judah will be evil in the eyes of Jehovah; and he will slay him.

And Jesse begat his first-born Eliab, and Abinidab the second, and Shimma the third,

And the sons of Jerahmeel, the first-born of Hezron will be the first born, Ram, and Bunah, and Oren and Ozem, Ahijah.

And the sons of Ram the firstborn of Jerahmeel, will be Maaz, and Jamin, and Eker.

And the sons of Caleb, Jerahmeel's brother, Mesha his first-born, he the father of Ziph; and the sons of Mareshah the father of Hebron.

These were the sons of Caleb the son of Hur, the first-born of Ephratah; Shobal the father of the city of forests,

And these were the sons of David which were born to him in Hebron: the first-born Amnon to Ahinoam the Jezreelitess; the second, Daniel to Abigail the Carmelitess:

And the sons of Josiah the firstborn, Johanan the second Jehoiakim; the third Zedekiah; the fourth Shallum.

And Penuel the father of Gedor, and Ezer the father of Hushah. These the sons of Hur, the first-born of Ephratah, the father of the house of bread.

And the sons of Reuben the first-born of Israel, (for he the firstborn; and in his defiling his father's bed, the birth-right was given to the sons of Joseph the son of Israel; and not to be enrolled for the birthright

The sons of Reuben, the first-born of Israel, Hanoch, and Pallu, Hezron and Carmi.

And the sons of Samuel: the first-born, Vashni and Abiah.

And Benjamin begat Bela his first-born, and Ashbel the second, and Aharah the third,

And his son the first-born, Abdon, and Zur, and Kish, and Baal, and Nadab,

And the sons of Eshek his brother, Ulam his first-born, Jelrush the second, and Eliphalet the third.

And from the Shilonites: Asaiah the first-born and his sons.

And Mattithiah from the Levites, he the first-born to Shallum the Korahite, in faithfulness over the work of the things cooked.

And his son the first-born, Abdon, and Zur, and Kish, and Baal, and Ner, and Nadab,

And to Meshelemiah, sons: Zechariah the first-born, Jediael the second, Zebadiah the third, Jathniel the fourth,

And to Obed-Edom, sons: Shemaiah, the first-born, Jehozabad the second, Josh the third, and Sacar the fourth, and Nathaniel the fifth,

And to Hosah from the sons of Merari, Shimri the head, (for he was not the first-born, and his father will set him for head;)