Truthful lips last forever

"Lips" represents what a person says. Alternate translation: "A truthful person endures forever" (See: rc://en/ta/man/jit/figs-metonymy)

a lying tongue is only for a moment

"Tongue" represents what a person says. Alternate translation: "the one who lies lasts only for a moment" (See: rc://en/ta/man/jit/figs-metonymy)