3.4.16
भावलक्षणे स्थेण्कृञ्वदिचरिहुतमिजनिभ्यस्तोसुन्
Operational rule vidhi
The affix तोसुन् comes in the छन्दस् (Vedas) after the following verbs, when mere name of the action is indicated viz. 1. स्था 'to stand' 2. इण् 'to go' 3. कृञ् 'to make' 4. वद् 'to speak' 5. चर् 'to go, to walk' 6. हु 'to sacrifice' 7. तम् 'to grow tired' 8. जन् 'to produce' .
Word by word (padaccheda)
Right context भावलक्षणे saptamī · ekavacanaLeft context स्था- इण्- कृञ्- वदि- चरि- हु- तमि- जनिभ्यः pañcamī · bahuvacanaSubstitute / term तोसुन् prathamā · ekavacana
- 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").
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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Full reading
भावलक्षणे स्था-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix तोसुन् comes in the छन्दस् (Vedas) after the following verbs, when mere name of the action is indicated viz. 1. स्था 'to stand' 2. इण् 'to go' 3. कृञ् 'to make' 4. वद् 'to speak' 5. चर् 'to go, to walk' 6. हु 'to sacrifice' 7. तम् 'to grow tired' 8. जन् 'to produce' ।
These are also Infinitives. The phrase कृत्यार्था is not to be read into this sutra. The word भावलक्षण qualifies the sense of the root (भावो लक्ष्यते येन). Thus, स्था--आ संस्थातोर्वेद्यां सीदन्ति = आसमादेः सीदन्ति । इण्--पुरा सूर्यस्योदेतोराधेयः । कृञ्-- पुरा वत्सानामपाकर्तोः । वद्--पुरा प्रवदितोरग्नौ प्रहोतव्यम् । चर्--पुरा प्रचरितोराग्नीध्रीये होतव्याः । (Gopatha Brahmana II.2.10)। हु--आ होतोरप्रमत्तस्तिष्ठति । तम्--आ तमितोरासोत (Taitt. Br. I.4.4. 2) । जन्--आ विजनितोः सम्भवाम (Taitt. S. II.5. I.5).
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.