John Gill Commentary Judges 21:11

"And this is the thing that ye shall do: ye shall utterly destroy every male, and every woman that hath lain by man." — Judges 21:11 (ASV)

And this is the thing that you shall do
Which they gave them in charge to execute:

you shall utterly destroy every male ;
without any reserve, young or old, married or unmarried:

and every woman that has lain by man ;
whether lawfully or unlawfully, in a married or unmarried state.