8.2.73
तिप्यनस्तेः
Operational rule vidhi
द is substituted for the final स् of a root with the exception of अस् 'to be' , before the personal ending ति (त्) when it stands at the end of a word.
Word by word (padaccheda)
Right context तिपि saptamī · ekavacanaTarget अनस्तेः ṣaṣṭhī · ekavacana
- Right context Saptamī (7th case): "when X follows", the operation applies to what precedes (1.1.66 तस्मिन्निति निर्दिष्टे पूर्वस्य). Also a condition or domain ("in the sense of").
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
तिपि अनस्तेः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
द is substituted for the final स् of a root with the exception of अस् 'to be' , before the personal ending ति (त्) when it stands at the end of a word.
The स् of a root can stand at the end of a word when the Personal-ending is dropped. Thus अचकाद् भवान्, अन्वशाद् भवान्, from the roots चकास् and शास् ॥ The Personal affix is elided by 6.1.68, and thereby स् comes to stand at the end of a Pada.
Why do we say 'before तिप्'? Observe चकास् formed by क्विप् affix added to the root.
Why do we say 'with the exception of अस्'? See आप एवेदं सलिलं सर्वम् आः ॥ Here आः is the Imperfect 3rd Person singular of अस् ॥ The ईट् is not added as a Vedic irregularity. See 7.3.93, 7.3.97.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.