'Firstborn Son' in the Bible

But his father Isaac said to him, “Who are you?”He answered, “I am Esau your firstborn son.”

Then you will say to Pharaoh: This is what Yahweh says: Israel is My firstborn son.

I told you: Let My son go so that he may worship Me, but you refused to let him go. Now I will kill your firstborn son!”

“If a man has two wives, one loved and the other unloved, and both the loved and the unloved bear him sons, and if the unloved wife has the firstborn son,

His firstborn son’s name was Joel and his second was Abijah. They were judges in Beer-sheba.

So he took his firstborn son, who was to become king in his place, and offered him as a burnt offering on the city wall. Great wrath was on the Israelites, and they withdrew from him and returned to their land.

Abdon was his firstborn son, then Zur, Kish, Baal, Nadab,

Abdon was his firstborn son, then Zur, Kish, Baal, Ner, Nadab,