Your eyes have seen what the Lord did because of Baal-peor ... the Lord thy God hath destroyed them from among you - It appears that the pestilence and the sword of justice overtook only the guilty in that affair (Num 25:1-9) while the rest of the people were spared. The allusion to that recent and appalling judgment was seasonably made as a powerful dissuasive against idolatry, and the fact mentioned was calculated to make a deep impression on people who knew and felt the truth of it.