3.3.90
यजयाचयतविच्छप्रच्छरक्षो नङ्
Operational rule vidhi
After the verbs 1. यज् 'to worship' 2. याच् 'to ask for' 3. यत् 'to strive' 4. विच्छ् 'to shine' 5. प्रच्छ् 'to ask' 6. रक्ष् 'to preserve', comes the affix नङ् with the force of denoting mere action etc.
Word by word (padaccheda)
Left context यज- याच- यत- विच्छ- प्रच्छ- रक्षः pañcamī · ekavacanaSubstitute / term न prathamā · ekavacana
- 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
यज-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After the verbs 1. यज् 'to worship' 2. याच् 'to ask for' 3. यत् 'to strive' 4. विच्छ् 'to shine' 5. प्रच्छ् 'to ask' 6. रक्ष् 'to preserve', comes the affix नङ् with the force of denoting mere action etc.
The conditions of sutras 18 and 19 are understood here also. The ङ् of नङ् is for the sake of prohibiting guna or vriddhi 1.1.5; as यज्ञः 'sacrifice'; याच्ञा 'solicitation'; यत्नः 'effort'; विश्नः 6.4.19 'lustre'; प्रश्नः 'a question'; रक्ष्णः 'protection.
The root प्रच्छ, by 6.1.16, ought to have changed its र into ॠ before the ङित् affix नङ्. Its not doing so must be taken to be an irregularity countenanced by Panini, as we know from the fact that Panini himself uses the form प्रश्नः in (III.2. II7).
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.