Deuteronomy 21:17
but he shall acknowledge the first-born, the son of the hated, 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 pre-eminence of dignity, and the pre-eminence of power.
Genesis 25:31-34
And Jacob said, Sell me first thy birthright.
Genesis 25:5-6
And Abraham gave all that he had unto Isaac.
1 Chronicles 5:1-2
And the sons of Reuben the first-born of Israel (for he was the first-born; but, forasmuch as he defiled his father's couch, his birthright was given unto the sons of Joseph the son of Israel; and the genealogy is not to be reckoned after the birthright.
Psalm 105:36
He smote also all the first-born in their land, The chief of all their strength.