6.3.133
ऋचि तुनुघमक्षुतङ्कुत्रोरुष्याणाम्
Operational rule vidhi
In the ऋग्वेद the finals of the particles 1. तु 2. नु 3. घ 4. मक्षु , the tense-affix तङ् , कु the ending त्र and the word उरुष्य are lengthened.
Word by word (padaccheda)
Right context ऋचि saptamī · ekavacanaTarget तु- नु- - मक्षु- तङ्- कु- त्र- उरुष्याणाम् ṣaṣṭhī · bahuvacana
- 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
ऋचि तु-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
In the ऋग्वेद the finals of the particles 1. तु 2. नु 3. घ 4. मक्षु , the tense-affix तङ् , कु the ending त्र and the word उरुष्य are lengthened.
Thus तु :- आ तू न इन्द्र वृत्रहन् (Rig IV. 32.1) नु - नू करणे ॥ घ :- उत वाचा स्थालात् ॥ मक्षु :- मक्षू गोमन्तमीमहे ॥ तङ् :- भरता जातवेदसम् ( Rig X. 176.2). तङ् is substitute त of था, when it is treated as ङित्, therefore it does not apply here, शृणोत ग्रावाणः 1.2.4. कु - कूमनस्; त्र -अत्रा गौः; उरुष्या णोग्नेः ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.