akjv@Numbers:3:41 @ And you shall take the Levites for me (I am the LORD)...instead of all the firstborn among...
akjv@1Chronicles:5:1 @...sons of Reuben the firstborn of...(for he was the firstborn; but for as much as he defiled his father' bed, his birthright was given to the sons of Joseph the son of Israel: and the genealogy is not to be reckoned after the birthright.