Nipson anomemata me monan opsin

Nipson anomēmata mē monan opsin (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 which was inscribed upon a holy water font outside the church of Hagia Sophia in Constantinople:

The phrase is attributed to Saint Gregory of Nazianzus.

The inscription can also be found in the following places:

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Wikipedia