Kural - 806

Who stand within the bounds quit not, though loss impends,
Association with the old familiar friends

Explanation
Those who stand within the limits (of true friendship) will not even in adversity give up the intimacy of long-standing friends.

Tamil Transliteration
Ellaikkan Nindraar Thuravaar Tholaivitaththum
Thollaikkan Nindraar Thotarpu.