Kural - 931

Seek not the gamester's play; though you should win,
Your gain is as the baited hook the fish takes in

Explanation
Though able to win, let not one desire gambling; (for) even what is won is like a fish swallowing the iron in fish-hook.

Tamil Transliteration
Ventarka Vendritinum Soodhinai Vendradhooum
Thoontirpon Meenvizhungi Atru.