Genesis 49:3

"And smote all the firstborn in Egypt; the chief of their strength in the tabernacles of Ham:"

"But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his. that...: Heb. that is found with him"

"He smote also all the firstborn in their land, the chief of all their strength."

"And Leah conceived, and bare a son, and she called his name Reuben: for she said, Surely the LORD hath looked upon my affliction; now therefore my husband will love me."

"And Joseph said unto his father, Not so, my father: for this is the firstborn; put thy right hand upon his head."

"Now the sons of Reuben the firstborn of Israel, (for he was the firstborn; but, forasmuch as he defiled his father's bed, his birthright was given unto the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birthright."

"The sons, I say, of Reuben the firstborn of Israel were, Hanoch, and Pallu, Hezron, and Carmi."

"And the children of Reuben, Israel's eldest son, by their generations, after their families, by the house of their fathers, according to the number of the names, by their polls, every male from twenty years old and upward, all that were able to go forth to war;"

"These are the sons of Israel; Reuben, Simeon, Levi, and Judah, Issachar, and Zebulun,"

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