8.2.69
रोऽसुपि
Operational rule vidhi
The word अहन् gets रेफादेश at पदान्त, except when followed by a सुप्-प्रत्यय.
Word by word (padaccheda)
Substitute / term रः prathamā · ekavacanaRight context असुपि saptamī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- 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").
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Full reading
रः असुपि
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
When no case-ending follows (i.e. at the end of a word, in the narrower sense), र् is substituted for the न् of अहन्।
Thus अहर्ददाति, अहर्भुङ्क्ते ॥ Why do we say 'when no case-ending follows'? Observe अहोभ्याम्, अहोभिः ॥ Here रु-called र् replaced the final न् of अहन् ॥ The difference between this रु-called र and the ordinary र is illustrated in the above set of examples. The रु-called र is changed to उ by 6.1.113, the ordinary र is not so changed.
Objection:- In अहर्ददाति and अहर्भुङ्क्ते the case-ending is elided after अहन्, and so by Pratyaya-lakshana, we may say that there is a case-ending here also ? Answer:- This is not so, because of the following maxim अहो रविधौ लुमता लुप्ते प्रत्यय लक्षणं न भवति ॥ The rule of pratya lakshana does not apply to the substitution of र for the final of अहन् when the affix has been elided by लुक् or लुप्. Therefore, this अहन् is not considered to be followed by सुप् or case-affix. But where an affix is elided by using the word लोप, there the rule of Pratyaya-lakshana does apply to अहन् ॥ As हे दीर्घाहोऽत्र, हे दीर्घाहो निदाघ. 8.2.7. Here the affix is elided by using the word 'lopa' by 6.1.68.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.