Kural - 809

Friendship of old and faithful friends,
Who ne'er forsake, the world commends

Explanation
They will be loved by the world, who have not forsaken the friendship of those with whom they have kept up an unbroken long-standing intimacy.

Tamil Transliteration
Ketaaa Vazhivandha Kenmaiyaar Kenmai
Vitaaar Vizhaiyum Ulaku.