Judges 12:6

12:6 then they said to him, “Say ‘Shibboleth!’” If he said, “Sibboleth” (and could not pronounce the word correctly), they grabbed him and executed him right there at the fords of the Jordan. On that day forty-two thousand Ephraimites fell dead.

Judges 21:22

21:22 When their fathers or brothers come and protest to us, we’ll say to them, “Do us a favor and let them be, for we could not get each one a wife through battle. Don’t worry about breaking your oath! You would only be guilty if you had voluntarily given them wives.’”