'First born' in the Bible

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!”

These are the heads of their fathers’ families:The sons of Reuben, the firstborn of Israel:Hanoch and Pallu, Hezron and Carmi.These are the clans of Reuben.

and every firstborn male in the land of Egypt will die, from the firstborn of Pharaoh who sits on his throne to the firstborn of the servant girl who is behind the millstones, as well as every firstborn of the livestock.

“I will pass through the land of Egypt on that night and strike every firstborn male in the land of Egypt, both man and beast. I am Yahweh; I will execute judgments against all the gods of Egypt.

Now at midnight the Lord struck every firstborn male in the land of Egypt, from the firstborn of Pharaoh who sat on his throne to the firstborn of the prisoner who was in the dungeon, and every firstborn of the livestock.

“Consecrate every firstborn male to Me, the firstborn from every womb among the Israelites, both man and domestic animal; it is Mine.”

you are to present to the Lord every firstborn male of the womb. All firstborn offspring of the livestock you own that are males will be the Lord’s.

You must redeem every firstborn of a donkey with a flock animal, but if you do not redeem it, break its neck. However, you must redeem every firstborn among your sons.

When Pharaoh stubbornly refused to let us go, the Lord killed every firstborn male in the land of Egypt, from the firstborn of man to the firstborn of livestock. That is why I sacrifice to the Lord all the firstborn of the womb that are males, but I redeem all the firstborn of my sons.’

“You must not hold back offerings from your harvest or your vats. Give Me the firstborn of your sons.

“The firstborn male from every womb belongs to Me, including all your male livestock, the firstborn of cattle or sheep.

You must redeem the firstborn of a donkey with a sheep, but if you do not redeem it, break its neck. You must redeem all the firstborn of your sons. No one is to appear before Me empty-handed.