Kural - 956

Whose minds are set to live as fits their sire's unspotted fame,
Stooping to low deceit, commit no deeds that gender shame

Explanation
Those who seek to preserve the irreproachable honour of their families will not viciously do what is detrimental thereto.

Tamil Transliteration
Salampatrich Chaalpila Seyyaarmaa Satra
Kulampatri Vaazhdhum En Paar.