Nipson anomēmata mē monan opsin (Ancient Greek: Νίψον ἀνομήματα, μὴ μόναν ὄψιν), meaning "Wash the sins, not only the face", or "Wash my transgressions, not only my face", is a Greek palindrome that is said to be first inscribed upon a holy water font outside the Hagia Sophia in Constantinople: