Kural - 141

Who laws of virtue and possession's rights have known,
Indulge no foolish love of her by right another's own

Explanation
The folly of desiring her who is the property of another will not be found in those who know (the attributes of) virtue and (the rights of) property.

Tamil Transliteration
Piranporulaal Pettozhukum Pedhaimai Gnaalaththu
Aramporul Kantaarkan Il.