Shloka 16
Adhyaya 32 — Rules for Parvana Śrāddha: Foods that Please the Ancestors and Items to Avoid
न लभेद्यत्र गौस्तृप्तिं नक्तं यच्चाप्युपाहृतम् ।
यन्न सर्वापचोत्सृष्टं यच्चाभोज्यं निपानजम् ॥
na labhed yatra gaus-tṛptiṃ naktaṃ yac cāpy upāhṛtam / yan na sarvā-paco'tsṛṣṭaṃ yac cābhojyaṃ nipānajam
牛でさえ満足して（安らかに）飲まないような場所の水は用いてはならない。夜に汲んで来た水も、また「完全で有能な料理人」によって放たれたのでない水（すなわち正しく整え扱われていない水）も用いてはならない。さらに、飲み場・水桶で飲用に適さぬ水も用いてはならない。
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FAQs
Purity is validated by practical signs: if even a cow avoids it, humans should not offer it in sacred rites. The verse also discourages careless procurement (night fetching) and unclean communal sources.
Dharma/ācāra guidance (ritual procedure), outside the pancalakṣaṇa core.
The ‘cow test’ makes nature a witness to purity. The Pitṛ-offering is ideally aligned with ṛta (order); unsuitable water symbolizes disorder entering the rite.