Kural - 787

Friendship from ruin saves, in way of virtue keeps;
In troublous time, it weeps with him who weeps

Explanation
(True) friendship turns aside from evil (ways) makes (him) walk in the (good) way, and, in case of loss if shares his sorrow (with him).

Tamil Transliteration
Azhivi Navaineekki Aaruyththu Azhivinkan
Allal Uzhappadhaam Natpu.