8.3.51
पञ्चम्याः परावध्यर्थे
Operational rule vidhi
The विसर्ग of the Ablative -5th case is changed to स् before परि meaning 'over'.
Word by word (padaccheda)
Target पञ्चम्याः ṣaṣṭhī · ekavacanaRight context परौ saptamī · ekavacanaRight context अध्यर्थे saptamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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
पञ्चम्याः परौ अध्यर्थे
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The विसर्ग of the Ablative -5th case is changed to स् before परि meaning 'over'.
The word Chhandas is understood here also. Thus दिवस्परि प्रथमं जज्ञे (Rig X. 45. I) अग्निर्हिमवतस्परि ॥ दिवस्परि, महस्परि ॥
Why do we say 'of the Ablative'? Observe अहिरिव भोगैः पर्येति बाहुम् ॥ Why do we say "before परि"? See एभ्योवा एतल्लोकेभ्यः प्रजापतिः समैरयत् ॥ Why do we say 'when परि means 'over''? See दिवः पृथिव्याः प्रर्योज उद्भृतम् (Rig. VI.47.27). Here परि has the sense of "on all sides".
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.