Kural - 43

The manes, God, guests kindred, self, in due degree,
These five to cherish well is chiefest charity

Explanation
The chief (duty of the householder) is to preserve the five-fold rule (of conduct) towards the manes, the Gods, his guests, his relations and himself.

Tamil Transliteration
Thenpulaththaar Theyvam Virundhokkal Thaanendraangu
Aimpulaththaaru Ompal Thalai.