'Firstborn Son' in the Bible

But his father Isaac asked him, "Who are you?" "I'm Esau, your firstborn son," he answered.

Joseph named his firstborn son Manasseh because, he said, "God has made me forget all of my hard life and my father's house."

You are to say to Pharaoh, "This is what the LORD says: "Israel is my firstborn son.

And I say to you, "Let my son go so he may serve me. If you refuse to let him go, then I will kill your firstborn son.'"'"

"Separate the descendants of Levi in place of all the firstborn sons of Israel and the livestock of the descendants of Levi in place of their livestock. The descendants of Levi belong to me, since I am the LORD.

Then he told his firstborn son Jether, "Get up and kill them!" But he was afraid, since he was still only a youngster.

The name of his firstborn son was Joel and the name of his second was Abijah. They were judges in Beer-sheba.

It was during Ahab's reign that Hiel the Bethelite rebuilt Jericho. He laid its foundations just as his firstborn son Abiram was dying, and he erected its gates while his youngest son Segub was dying, thus fulfilling the message that the LORD delivered through Nun's son Joshua.

So he took his firstborn son, whom he intended to reign after him, and offered him up as a burnt offering on the wall. There subsequently came great anger against Israel, so they abandoned the attack and returned to their homeland.

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

His firstborn son was Abdon, followed by Zur, Kish, Baal, Ner, Nadab,

Then they will mourn for him, as for an only son. They will grieve bitterly for him, as for a firstborn son. At that time, Jerusalem will mourn deeply, like the mourning about Hadad-rimmon that took place in the plain of Megiddo.

as it is written in the Law of the Lord, "Every firstborn son is to be designated as holy to the Lord."