Kural - 519

Fortune deserts the king who ill can bear,
Informal friendly ways of men his tolls who share

Explanation
Prosperity will leave (the king) who doubts the friendship of the man who steadily labours in the discharge of his duties.

Tamil Transliteration
Vinaikkan Vinaiyutaiyaan Kenmaive Raaka
Ninaippaanai Neengum Thiru.