Kural - 278

Many wash in hollowed waters, living lives of hidden shame;
Foul in heart, yet high upraised of men in virtuous fame

Explanation
35 There are many men of masked conduct, who perform their ablutions, and (make a show) of.

Tamil Transliteration
Manaththadhu Maasaaka Maantaar Neeraati
Maraindhozhuku Maandhar Palar.