Aśauca-vidhi (Rules of Impurity) within Śrāddha-kalpa — Chapter on Testing/Selecting Brahmanas and Honoring the Atithi
पाप्मानं गृह्यते क्षिप्रमिष्टापूर्त्तं च नश्यति / यतिस्तु सर्वविप्राणां सर्वेषामग्रतो भवेत्
pāpmānaṃ gṛhyate kṣipramiṣṭāpūrttaṃ ca naśyati / yatistu sarvaviprāṇāṃ sarveṣāmagrato bhavet
Sin swiftly takes hold, and the merit of iṣṭa‑pūrta (sacrifices and pious gifts) is lost; but the yati (renunciant) stands foremost among all vipras (brahmins).