Kural - 192

Words without sense, where many wise men hear, to pour
Than deeds to friends ungracious done offendeth more

Explanation
To speak useless things in the presence of many is a greater evil than to do unkind things towards friends.

Tamil Transliteration
Payanila Pallaarmun Sollal Nayanila
Nattaarkan Seydhalir Reedhu.