The Book of Ritual attributed to Bhadrabāhu. It has three sections:

1. ‘Jina-caritra’ – ‘Lives of the Jinas’
2. ‘Sthavirāvalī’ – ‘String of Elders’
3. ‘Sāmācārī’ – ‘Right Monastic Conduct’.

A significant sacred text for Śvetāmbara Jains, the Kalpa-sūtra has a central role in the annual Paryuṣaṇ festival.