Genesis 49:3

49:3 Reuben, you are my firstborn,

my might and the beginning of my strength,

outstanding in dignity, outstanding in power.

Genesis 49:7

49:7 Cursed be their anger, for it was fierce,

and their fury, for it was cruel.

I will divide them in Jacob,

and scatter them in Israel! ¹ 

[49:7]  ¹ sn Divide…scatter. What is predicted here is a division of their tribes. Most commentators see here an anticipation of Levi being in every area but not their own. That may be part of it, but not entirely what the curse intended. These tribes for their ruthless cruelty would be eliminated from the power and prestige of leadership.