奉为圭臬

verb

to regard as a standard or model; to uphold as a guiding principle

Used formally to express high reverence for a doctrine, text, or person's words, treating them as the ultimate authority to be followed. The idiom comprises four characters: 奉 (to revere), 为 (as), 圭 (a type of jade tablet used in ancient rituals), 臬 (a sundial or a standard). Together, it metaphorically means to treat something as a precise, authoritative standard, much like a ritual instrument or a sundial.