'First born' in the Bible

And thou shall say to Pharaoh, Thus says LORD, Israel is my son, my first-born,

and I have said to thee, Let my son go, that he may serve me, and thou have refused to let him go. Behold, I will slay thy son, thy first-born.

These are the heads of their fathers' houses. The sons of Reuben the first-born of Israel: Hanoch, and Pallu, Hezron, and Carmi, these are the families of Reuben.

and all the first-born in the land of Egypt shall die, from the first-born of Pharaoh who sits upon his throne, even to the first-born of the maid-servant that is behind the mill, and all the first-born of cattle.

For I will go through the land of Egypt in that night, and will smite all the first-born in the land of Egypt, both man and beast, and against all the gods of Egypt I will execute judgments. I am LORD.

And it came to pass at midnight, that LORD smote all the first-born in the land of Egypt, from the first-born of Pharaoh who sat on his throne to the first-born of the captive who was in the dungeon, and all the first-born of cattl

Sanctify to me all the first-born, whatever opens the womb among the sons of Israel. Both of man and of beast, it is mine.

And every firstling of a donkey thou shall redeem with a lamb, and if thou will not redeem it, then thou shall break its neck. And all the first-born of man among thy sons thou shall redeem.

And it came to pass, when Pharaoh would hardly let us go, that LORD slew all the first-born in the land of Egypt, both the first-born of man, and the first-born of beast. Therefore I sacrifice to LORD all that opens the womb, being

Thou shall not delay to offer from thy harvest, and from the outflow of thy presses. The first-born of thy sons thou shall give to me.

And the firstling of a donkey thou shall redeem with a lamb, and if thou will not redeem it, then thou shall break its neck. All the first-born of thy sons thou shall redeem. And none shall appear before me empty.