Kural Number: 0143 (Vizhiyappan's Translation)

{பால்: 1 - அறத்துப்பால்; இயல்: 02 - இல்லறவியல்; அதிகாரம்: 015 - பிறனில் விழையாமை; குறள் எண்: 0143}

{Division: 1 - Ethics ; Section: 02 - Family Ethics; Chapter: 015 - Denying affair with others' Spouse; Kural Number: 0143}

விளிந்தாரின் வேறல்லர் மன்ற தெளிந்தாரில்
தீமை புரிந்தொழுகு வார்

Who has affair with spouse of
trusted person, is dead

Vizhiyappan's Commentary: Those who have an illegal affair - with the spouse of someone who has completely trusted them - are not different from dead.

(Likewise...)

Those who have an enmity - with the family of someone who gave best hospitality - are not different from the animals. 

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Link: Explanation in Tamil