6.1.121
अवपथासि च
Operational rule vidhi
In the यजुर्वेद , when the gravely accented अ of अवपथास् follows ए or ओ , the vowels retain their original form.
Word by word (padaccheda)
Right context अवपथासि saptamī · ekavacanaIndeclinable च avyaya
- 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").
- Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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Full reading
अवपथासि च
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In the यजुर्वेद , when the gravely accented अ of अवपथास् follows ए or ओ , the vowels retain their original form.
Thus त्री रुद्रेभ्यो अवपथाः ॥ The word अवपथाः is 2nd person Singular Imperfect of वप् in the Atmanepada. Thus अ + वप् + शप् + थास् ॥ The अ is grave by 8.1.28. When it is not gravely accented, the अ drops. As यद्रुद्रेभ्योऽवपथाः ॥ Here अ is not grave by virtue of 8.1.30.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.