6.1.22
स्फायः स्फी निष्ठायाम्
Operational rule vidhi
The स्फी is the substitute of स्फाय 'to swell', the निष्ठा affixes follow.
Word by word (padaccheda)
Target स्फायः ṣaṣṭhī · ekavacanaWord स्फी Right context निष्ठायाम् saptamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Word Case not marked in the source data.
- 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
स्फायः स्फी निष्ठायाम्
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The स्फी is the substitute of स्फाय 'to swell', the निष्ठा affixes follow.
Thus स्फीतः, स्फीतवान् ॥ Why do we say "when the Nishtha affixes follow"? Observe स्फातिः formed by क्तिन् ॥ In the phrase स्फाती भवति, the word स्फाती is the feminine of the word स्फाति formed by क्तिन् ॥ The phrase निष्ठायाम् "when the Nishtha follows" governs all the subsequent sutras up to 6.1.29.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.