'Pre eminence' in the Bible

Reuben, my first-born, thou, My vigour, and the first-fruit of my strength, - Pre-eminence of elevation and pre-eminence of power:

Boiling over like water, thou mayest not have pre-eminence, Because thou didst mount the bed of thy father, - Then, wast thou profane - My marriage-bed, he mounted!