杀鸡儆猴

Explanation: Chickens to monkeys to see. Analogy with the punishment of a person's way to warn other people. Thesaurus:  execute one as a warning to a hundred, kill the chicken to frighten the monkey, Shajixiahou, serve to warn others against following a bad example, punish one as a warning to others, With a warning to a hundred Antonym Group:  give quarter, lenity, Let bygones be bygones, past not censure, Extrajudicial Ren, Fawai favor