Kural - 794

Who, born of noble race, from guilt would shrink with shame,
Pay any price so you as friend that man may claim

Explanation
The friendship of one who belongs to a (good) family and is afraid of (being charged with) guilt, is worth even purchasing.

Tamil Transliteration
Kutippirandhu Thankan Pazhinaanu Vaanaik
Kotuththum Kolalventum Natpu.