What does Judges 20:6 mean?

The Levite man (Judges 19:1–3; 22–27) is giving official testimony to the gathered leaders of Israel. He recounts what was done to his concubine by the men of Gibeah. He also explains what he did to her body in response and begins to justify his gruesome act.

After the frenzied mob raped and beat her and she died, the Levite took her body back to his home. He then cut her violated body into twelve pieces. He sent those pieces throughout all of Israel. His intended purpose was to call Israel to respond to the despicable atrocity which was committed. His messages were gory and unsettling but intended for a purpose; at least in his own mind, he was working to see justice done.

In a warped sense, this man is mirroring the assigned priestly role given to his tribe of Levi (Numbers 3:5–10). He is representing the Lord by calling Israel to deal with grievous, heinous sin and open violation of His covenant. None of this is stated; it's not stated if this Levite normally performed the role of priest. His actions, however, manage to unite Israel under a desire to honor God, and to respond to an instance of horrific sin.