Charles Spurgeon Commentary Genesis 49:6-7

"O my soul, come not thou into their council; Unto their assembly, my glory, be not thou united; For in their anger they slew a man, And in their self-will they hocked an ox. Cursed be their anger, for it was fierce; And their wrath, for it was cruel: I will divide them in Jacob, And scatter them in Israel." — Genesis 49:6-7 (ASV)

Instruments of cruelty are in their habitations. O my soul, come not thou into their secret; unto their assembly, mine honour, be not thou united: for in their anger they slew a man, and in their selfwill they digged down a wall. Cursed be their anger, for it was fierce; and their wrath, for it was cruel: I will divide them in Jacob, and scatter them in Israel.

Therefore, we do not read of the tribe of Simeon in the blessing of Moses at the end of Deuteronomy; but the Levites had this curse turned into a blessing, for, though they were scattered, yet they were scattered as priests and instructors to the other tribes. Happy is that man who, though he begins with a dark shadow resting upon him, so lives as to turn even that shadow into bright sunlight. Levi gained a blessing at the hands of Moses, one of the richest blessings of any of the tribes. This holy man, Jacob, in dying, did not express himself according to the rules of natural affection but yielded himself up to the Spirit of God; therefore, he had to say very much that must have been very bitter for a father to say, and he said it in all faithfulness, being taught by the Spirit concerning things to come.