7.4.27
रीङ् ऋतः
Operational rule vidhi
री is substituted for the final short ऋ of a अङ्ग (stem) before an affix beginning with य् when it is not a कृत् or a सार्वधातुक affix and the Adverbial affix च्वि -- अभूततद्भावे कृभ्वस्तियोगे सम्पद्यकर्तरि च्विः (5.4.50).
Word by word (padaccheda)
Substitute / term रीङ् prathamā · ekavacanaTarget ऋतः ṣaṣṭhī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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Full reading
रीङ् ऋतः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
ऋतः → रीङ्
Replace ṛtaḥ with rīṅ. Inherited words (anuvṛtti) may add further conditions.
Commentary
री is substituted for the final short ऋ of a अङ्ग (stem) before an affix beginning with य् when it is not a कृत् or a सार्वधातुक affix and the Adverbial affix च्वि -- अभूततद्भावे कृभ्वस्तियोगे सम्पद्यकर्तरि च्विः 5.4.50.
The anuvritti of क्ङिति is, however, not understood in this sutra; that of च्वि and अकृत्सार्वधातुकयोः is present. Thus मात्रीयति and पित्रीयति with क्यच् 3.1.8, मात्रीयते, पित्रीयते with क्यङ् 3.1.11. चक्रीयते with यङ्, मात्रीभूतः with च्वि ॥ The कित् and ङित् not being understood here, we have पितुरागतं = पित्र्यम् 4.3.79, which is thus formed पितृ + यत् = पित्री + य = पित्र + य (ई being elided by 6.4.148). Why do we say short ऋ? Observe चेकीर्यते, from कृ विक्षेपे, with यङ्, ऋत इद् धातोः and हलिच lengthening. निजेगिल्यते from कॄ and गॄ ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.