49:5 Simeon and Levi are brethren - Brethren in disposition, but unlike their father: they were passionate and revengeful, fierce and wilful; their swords, that should have been only weapons of defence, were (as the margin reads it) weapons of violence, to do wrong to others, not to save themselves from wrong.
49:3-7 Reuben was the first-born; but by gross sin, he forfeited the birthright. The character of Reuben is, that he was unstable as water. Men do not thrive, because they do not fix. Reuben's sin left a lasting infamy upon his family. Let us never do evil, then we need not fear being told of it. Simeon and Levi were passionate and revengeful. The murder of the Shechemites is a proof of this. Jacob protested against that barbarous act. Our soul is our honour; by its powers we are distinguished from, and raised above, the beasts that perish. We ought, from our hearts, to abhor all bloody and mischievous men. Cursed be their anger. Jacob does not curse their persons, but their lusts. I will divide them. The sentence as it respects Levi was turned into a blessing. This tribe performed an acceptable service in their zeal against the worshippers of the golden calf, Ex 32. Being set apart to God as priests, they were in that character scattered through the nation of Israel.
