C. F. Keil and Franz Delitzsch on Judges 21:13-14

Jdg 21:13-14

The congregation then sent to call the Benjaminites, who had taken refuge upon the rock Rimmon, and gave them as wives, when they returned (sc., into their own possessions), the 400 virgins of Jabesh who had been preserved alive. “But so they sufficed them not” (כּן, so, i.e., in their existing number, 400: Bertheau). In this remark there is an allusion to what follows.