Deuteronomy 21:17
But he shall acknowledge the son of the hated for the first-born, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the first-born is his.
Genesis 49:3
Reuben, thou art my first-born, my might, and the beginning of my strength, the excellence of dignity, and the excellence of power:
Genesis 25:31-34
And Jacob said, Sell to me this day thy birth-right.
Genesis 25:5-6
And Abraham gave all that he had to Isaac.
1 Chronicles 5:1-2
Now the sons of Reuben the first-born of Israel, (for he was the first-born; but, forasmuch as he defiled his father's bed, his birth-right was given to the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birth-right.
Psalm 105:36
He smote also all the first-born in their land, the chief of all their strength.