In Jain usage, “Bāsā‑sūtra” (often written as “basa sutra”) means the short sūtra recited—mainly in the Śvetāmbara tradition—when accepting a place to stay (vāsa) for the day or for cāturmās. Its purpose is to sanctify the residence, internalize restraint while staying there, and seek forgiveness for any harm that might occur in arranging or using the lodging. It is part of the Pratikraman/Chaitya‑vandana liturgy, not a separate Āgama.

Traditions

• Śvetāmbara: Bāsā‑sūtra is a brief formula within daily/seasonal liturgy connected with accepting residence.
• Digambara: A distinct text by this exact name is not used; the parallel idea is taking permission for residence and observing rules of stay, along with lay vows like Vāsāgāra vrata. The spiritual intent—restraint and non‑violence while staying—is the same.

For a simple overview of Pratikraman and its related sūtras, see this guide: