नित्यं मन्त्रे

Operational rule vidhi

In the मन्त्राः , these words जुष्ट and अर्पित have always the acute on the first syllable.

Word by word (padaccheda)

Substitute / term नित्यम् prathamā · ekavacanaRight context मन्त्रे 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

नित्यम् मन्त्रे

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

In the मन्त्राः , these words जुष्ट and अर्पित have always the acute on the first syllable.
Thus जु꣡ष्ट देवानाम꣡र्पितं पितॄणाम् ॥ Some say that this rule applies only to जुष्ट and not to अर्पित; in which option is allowed even in the Mantra : so that it has acute on the last in the Mantra even : e.g.तस्मिन्साकं त्रिशता न शंकवोर्पिता꣡ ॥

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