Judges 20:12
"And the tribes of Israel sent men through all the tribe of Benjamin, saying, What wickedness is this that is done among you?"
Cross References (ranked by relevance)
Deuteronomy 13:14
Then shalt thou enquire, and make search, and ask diligently; and, behold, if it be truth, and the thing certain, that such abomination is wrought among you;
Deuteronomy 20:10
When thou comest nigh unto a city to fight against it, then proclaim peace unto it.
Romans 12:18
If it be possible, as much as lieth in you, live peaceably with all men.