मनु स्मृति - अतिथि

अप्रणोद्योऽतिथिः सायं सूर्योढो गृहमेधिना |
काले प्राप्तस्त्वकाले वा नास्यानश्नन् गृहे वसेत् ||

- मनु स्मृति

When a guest arrives in the evening, one must insist they spend the night in their house. When a guest arrives during lunch (dinner) time or any odd time, he must be served food.

- Manu Smriti