'First born' in the Bible

And Canaan begot Sidon, his firstborn, and Heth,

And the first-born said to the younger, Our father is old, and there is not a man in the land to come in to us after the manner of all the earth:

And they gave their father wine to drink that night. And the first-born went in, and lay with her father, and he did not know of her lying down, nor of her rising.

And it came to pass on the next day that the first-born said to the younger, Lo, I lay last night with my father: let us give him wine to drink to-night also, and go thou in, lie with him, that we may preserve seed alive of our father.

And the first-born bore a son, and called his name Moab: the same is the father of the Moabites to this day.

Uz his first-born, and Buz his brother, and Kemuel the father of Aram,

And these are the names of the sons of Ishmael by their names according to their generations: Nebaioth, the firstborn of Ishmael; and Kedar, and Adbeel, and Mibsam,

And Jacob said to his father, I am Esau, thy firstborn. I have done according as thou didst say to me. Arise, I pray thee, sit and eat of my venison, in order that thy soul may bless me.

And Isaac his father said to him, Who art thou? And he said, I am thy son, thy firstborn, Esau.

And Laban said, It is not so done in our place, to give the younger before the firstborn.

The sons of Leah: Reuben Jacob's firstborn and Simeon, and Levi, and Judah, and Issachar, and Zebulun.

These are the chiefs of the sons of Esau. The sons of Eliphaz, the firstborn of Esau: chief Teman, chief Omar, chief Zepho, chief Kenaz,

And Judah took a wife for Er his firstborn, and her name was Tamar.

And Er, Judah's firstborn, was wicked in the sight of Jehovah, and Jehovah slew him.

And Joseph called the name of the firstborn Manasseh For God has made me forget all my toil, and all my father's house.

And they sat before him, the firstborn according to his birthright, and the youngest according to his youth; and the men marvelled one at another.

And these are the names of the sons of Israel who came into Egypt: Jacob and his sons. Jacob's firstborn, Reuben.

But Israel stretched out his right hand, and laid it on Ephraim's head now he was the younger and his left hand on Manasseh's head; guiding his hands intelligently, for Manasseh was the firstborn.

And Joseph said to his father, Not so, my father, for this is the firstborn: put thy right hand on his head.

Reuben, thou art my firstborn, My might, and the firstfruits of my vigour: Excellency of dignity, and excellency of strength.