Atri Smriti 3.12

3.12

śatarudraṃ dharmaśiraṃ trisuparṇaṃ mahāvratam
aniṣaṅgādayastobhāsāmāni vyāhṛtistathā

the Śatarudrīya, the Dharmaśiras, the Trisuparṇa, the Mahāvrata, / the Aniṣaṅga and other stobhas, the sāmans, and the sacred utterances;