49:3-4
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3Reuben, thou art my first-born, my might, and the beginning of my strength; The pre-eminence of dignity, and the pre-eminence of power.
4Boiling over as water, thou shalt not have the pre-eminence; Because thou wentest up to thy father`s bed; Then defiledst thou it: he went up to my couch.
Genesis 49:3-4 (ASV)