Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
षडङ्गविद्ध्यानयोगौ सर्वतत्रस्तथैव च / यायावरश्च पञ्चैते विज्ञेयाः पङ्क्तिपावनाः
ṣaḍaṅgaviddhyānayogau sarvatatrastathaiva ca / yāyāvaraśca pañcaite vijñeyāḥ paṅktipāvanāḥ
The knower of the ṣaḍaṅgas, the practitioner of dhyāna‑yoga, the adept in all tantras, and the yāyāvara—these five are to be known as paṅkti‑pāvana, purifiers of the sacred row.