अनुदात्ते च कुधपरे

Operational rule vidhi

In the यजुर्वेद , when an अनुदात्त अ is followed by a Guttural or a ध, the antecedent ए or ओ retains it s form, as well as this subsequent अ.

Word by word (padaccheda)

Right context saptamī · ekavacanaIndeclinable च avyayaRight context कुधपरे 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").
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

च कुधपरे

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 an अनुदात्त अ is followed by a Guttural or a ध, the antecedent ए or ओ retains it s form, as well as this subsequent अ।
Thus अयं सो अग्निः (Yaj. 12.47), अयं सो अध्वरः ॥ Why do we say when अ is gravely accented ? Observe अधोऽग्रे, here अग्रे has acute accent on the first syllable. Why do we say "when followed by a Guttural (कु) or a ध"? Observe सोऽयमग्निः सहस्त्रियः ॥

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.