Genesis 49:1-3

And Jacob called unto his sons, and said: Gather yourselves together, that I may tell you that which shall befall you in the latter days. Assemble yourselves, and hear, ye sons of Jacob; And hearken unto Israel your father. 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.