6.3.131
मन्त्रे सोमाश्वेन्द्रियविश्वदेव्यस्य मतौ
Operational rule vidhi
In a मन्त्र the final vowels of 1. सोम 2. अश्व 3. इन्द्रिय and 4. विश्वदेव्य are lengthened when the affix मतुप् follows.
Word by word (padaccheda)
Right context मन्त्रे saptamī · ekavacanaTarget सोम- अश्व- इन्द्रिय- विश्वदेव्यस्य ṣaṣṭhī · ekavacanaRight context मतौ saptamī · 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
मन्त्रे सोम-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In a मन्त्र the final vowels of 1. सोम 2. अश्व 3. इन्द्रिय and 4. विश्वदेव्य are lengthened when the affix मतुप् follows.
Thus सोमावती, अश्वावती, इन्द्रियावती, विश्वदेव्यावती ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.