Kural - 1066

E'en if a draught of water for a cow you ask,
Nought's so distasteful to the tongue as beggar's task

Explanation
There is nothing more disgraceful to one's tongue than to use it in begging water even for a cow.

Tamil Transliteration
Aavirku Neerendru Irappinum Naavirku
Iravin Ilivandha Thil.