5.2.102
तपःसहस्राभ्यां विनीनी
Operational rule vidhi
The affixes विनि and इनि come with the force of मतुप् after the words तपस् and सहर respectively.
Word by word (padaccheda)
Left context तपः- सहस्राभ्याम् pañcamī · dvivacanaSubstitute / term विनि- इनी prathamā · dvivacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
तपः-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affixes विनि and इनि come with the force of मतुप् after the words तपस् and सहर respectively.
The word तपस् ends in अस्, and therefore by 5.2.121, it would have taken विनि; similarly सहस्र ends in अ, and by 5.2.115, it would have taken इनि; it may, therefore, be objected, where is the necessity for the present sutra? To this it is replied, that by the next sutra, these words take the affix अण् also; so that, had there not been this present sutra, the अण् would have debarred the application of इनि and विनि of 5.2.115 and 5.2.121. The affix ठन् 5.1.115 is also debarred after the word सहस्र, though it ends in अ ॥
Thus तपोऽस्यास्मिन् वा विद्यते = तपस्विन् nom. तपस्वी ॥ Similarly सहस्रिन् nom. सहस्रा ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.