8.3.82
अग्नेः स्तुत्स्तोमसोमाः
Operational rule vidhi
ष् is substituted for the स् of 1. स्तुत 2. स्तोम and 3. सोम when preceded by अग्नि in a compound.
Word by word (padaccheda)
Left context अग्नेः pañcamī · ekavacanaSubstitute / term स्तुत्- स्तोम- सोमाः prathamā · bahuvacana
- 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
अग्नेः स्तुत्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
ष् is substituted for the स् of 1. स्तुत 2. स्तोम and 3. सोम when preceded by अग्नि in a compound.
Thus अग्निष्टुत्, अग्निष्टोमः, अग्नीषोमः ॥
Ishti:- The इ of अग्नि is lengthened before सोम and it is after such lengthened ई, that the स of सोम is changed to ष, otherwise not. As अग्निसोमौ माणवकौ ॥ So also अग्निसोमौ तिष्ठतः (where 'agni' means fire, and 'soma' a kind of herb) "the fire and the soma plant are here."
When there is no compounding we have अग्ने सोमः ॥
The word अग्निष्टुत् is formed by क्विप्, the sacrifice in which Agni is praised (स्तूयते) is so called. अग्निष्टोमः is also the name of a sacrifice: the first division (संस्था) of the Soma-yaga. अग्नीषोमः is a देवता-द्वन्द्वः so where there is no Devata-Dvandva, the ष change will not take place. Thus where Agni and Soma are names of two boys, or where they refer to physical fire and herb. According to Asvalayana there is lengthening and ष change in the last case also, as अग्नीषोमौ प्रणेष्यामि ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.