'Firstborn Son' in the Bible

If a man have two wives, one beloved, and another hated, and they have born him children, both the beloved and the hated; and if the firstborn son be hers that was hated:

And his firstborn son Abdon, and Zur, and Kish, and Baal, and Nadab,

And his firstborn son Abdon, then Zur, and Kish, and Baal, and Ner, and Nadab,

And knew her not till she had brought forth her firstborn son: and he called his name JESUS.

And she brought forth her firstborn son, and wrapped him in swaddling clothes, and laid him in a manger; because there was no room for them in the inn.