Kural - 274

'Tis as a fowler, silly birds to snare, in thicket lurks
When, clad in stern ascetic garb, one secret evil works

Explanation
He who hides himself under the mask of an ascetic and commits sins, like a sportsman who conceals himself in the thicket to catch birds.

Tamil Transliteration
Thavamaraindhu Allavai Seydhal Pudhalmaraindhu
Vettuvan Pulsimizhth Thatru.