17 The Benjamite survivors must have heirs,” they said, “so that a tribe of Israel will not be wiped out.

Read Judges 21:17 Using Other Translations

And they said, There must be an inheritance for them that be escaped of Benjamin, that a tribe be not destroyed out of Israel.
And they said, "There must be an inheritance for the survivors of Benjamin, that a tribe not be blotted out from Israel.
There must be heirs for the survivors so that an entire tribe of Israel is not wiped out.