the three rules (ruler guides subject, father guides son and husband guides wife) and five constant virtues of Confucianism (benevolence 仁, righteousness 義|义, propriety 禮|礼, wisdom 智 and fidelity 信)
Definitions (Wiktionary)
phrase, idiomatic
the three essential relationships (between ruler and subject, father and son, and husband and wife) and five constant virtues (justice, politeness, wisdom, fidelity and benevolence) (syn.) 纲常, 綱常