Perhaps it's “The Proverbial Murder Mystery” (2019), a short story by Scott Alexander. The story is told by a police officer who is investigating murder in a strange government office building. It starts sort of silly.
“We’re the United States’ only proverb laboratory. Our mission is to stress-test the nation’s proverbs. To provide rigorous backing for the good ones, and weed out the bad ones. […] Consider: he who hesitates is lost. But also: look before you leap. Suppose you’re a business executive who spots a time-limited opportunity. What do you do? Hesitate? Or leap without looking? Eggheads devise all sorts of fancy rules about timing the market and relying on studies, but when push comes to shove most people are going to rely on the simple sayings they learned as a child. If you can keep your stock of proverbs more up-to-date than your competitor’s, that gives you a big business advantage.”
But the investigator gets used to all the strange things happening in the building, and uncovers the dark secret of the agency.
The Proverb Laboratory didn’t exist to test proverbs at all. Or they did, but not in the way they claimed. The Proverb Laboratory existed to test the Machine. A device that makes proverbs real. The Machine exerted some kind of invisible force. The closer you got, the more the English language warped reality in order to make proverbs come true.
Then the story gets even more silly, as the investigator and the murderer both use the power of proverbs offensively in a deadly chase scene.