Kural - 277

Outward, they shine as 'kunri' berry's scarlet bright;
Inward, like tip of 'kunri' bead, as black as night

Explanation
(The world) contains persons whose outside appears (as fair) as the (red) berry of the Abrus, but whose inside is as black as the nose of that berry.

Tamil Transliteration
Purangundri Kantanaiya Renum Akangundri
Mukkir Kariyaar Utaiththu.