Kural - 720

Ambrosia in the sewer spilt, is word
Spoken in presence of the alien herd

Explanation
To utter (a good word) in the assembly of those who are of inferior rank is like dropping nectar on the ground.

Tamil Transliteration
Anganaththul Ukka Amizhdhatraal Thanganaththaar
Allaarmun Kotti Kolal.