4.2.15
स्थण्डिलाच्छयितरि व्रते
Operational rule vidhi
The affix अञ् already ordained -- प्राग्दीव्यतोऽण् (4.1.83), comes after the word स्थण्डिल being in the Locative -7th case in construction in the sense of 'a sleeper thereon' and the whole word so formed denotes 'a person performing a vow'.
Word by word (padaccheda)
Left context स्थण्डिलात् pañcamī · ekavacanaRight context शयितरि saptamī · ekavacanaRight context व्रते saptamī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- 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
स्थण्डिलात् शयितरि व्रते
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The affix अञ् already ordained -- प्राग्दीव्यतोऽण् 4.1.83, comes after the word स्थण्डिल being in the Locative -7th case in construction in the sense of 'a sleeper thereon' and the whole word so formed denotes 'a person performing a vow'.
Thus स्थण्डिले शयितुं व्रतमस्य = स्थाण्डिलः 'a person who has taken the vow to sleep on the bare ground' i. e. an ascetic or a Brahmachari.
Why do we say 'vow'? Observe स्थण्डिले शेते ब्रह्मदत्तः 'Brahmadatta sleeps on the bare ground', not as a matter of vow, but of necessity or pleasure. The word व्रत means a 'vow or an observance ordained by religious codes'.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.