Genesis 49:1-4

1And Jacob called to his sons, and said, Gather yourselves together, that I may tell you that which shall befall you in the last days. 2Gather yourselves together, and hear, ye sons of Jacob; and hearken to Israel your father. 3Reuben, thou art my firstborn, my might, and the beginning of my strength, the excellency of dignity, and the excellency of power: 4Unstable as water, thou shalt not excel; because thou wentest up to thy father’s bed; then thou didst defile it : he went up to my couch.12