Kural - 323

Alone, first of goods things, is 'not to slay';
The second is, no untrue word to say

Explanation
Not to destroy life is an incomparably (great) good next to it in goodness ranks freedom from falsehood.

Tamil Transliteration
Ondraaka Nalladhu Kollaamai Matradhan
Pinsaarap Poiyaamai Nandru.