for old times' sake

See also: for old time's sake

English

(idiomatic) An appeal to the nostalgia of prior experiences to convince someone to do something.
Synonym: one more time for the sweet souvenir
- 2019 April 14, Guo Rui, “China’s war on organised crime, corrupt officials sees 79,000 people detained”, in South China Morning Post‎^[1], →ISSN, →OCLC, archived from the original on April 14, 2019, Politics‎^[2]:
  When gang leader Chen Xinfu was apprehended in Haikou, capital of south China’s island province of Hainan, earlier this month he told his arresting officers: “Guys, take good care of me, for old times’ sake.”
  Unlike the hundreds of other mob bosses who have been rounded up in recent months, Chen has a special relationship with the police: before his descent into the criminal underworld, he was deputy head of the public security bureau in the city’s Xiuying district.