Genesis 49:3-4

JPS_ASV_Byz^{(i) 3} Reuben, thou art my first-born, my might, and the first-fruits of my strength; the excellency of dignity, and the excellency of power. ⁴ Unstable as water, have not thou the excellency; because thou wentest up to thy father's bed; then defiledst thou it - he went up to my couch.