John Calvin Commentary Genesis 49:27

"Benjamin is a wolf that raveneth: In the morning she shall devour the prey, And at even he shall divide the spoil." — Genesis 49:27 (ASV)

Benjamin shall ravin as a wolf. Some Jews think the Benjamites are condemned here, because after they allowed lusts to prevail among them like lawless robbers, they were eventually cut down and almost destroyed by a terrible slaughter for defiling the Levite’s wife.

Others regard it as an honorable commendation, by which Saul or Mordecai, who were both from the tribe of Benjamin, were honored.

Contemporary interpreters quite inappropriately apply it to the apostle Paul, who was transformed from a wolf into a preacher of the Gospel.

Nothing seems more probable to me than that the disposition and habits of the whole tribe are described here: namely, that they would live by plunder. In the morning they would seize and devour the prey, in the evening they would divide the spoil; by these words, he describes their diligence in plundering.