The idiom 'please step into the jar' comes from the Annals of Tang of the Comprehensive Mirror in Aid of Governance.
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history
司马光 divided his history of 294 juan into sixteen annals named after dynasties, and the Annals of Tang, 81 juan on the Tang dynasty, is the longest. It also records the praise of 狄仁杰 behind 桃李满天下.