7.2.62
उपदेशेऽत्वतः
Operational rule vidhi
After a root which possesses a short अ as its root-vowel in the original enunciation (the धातुपाठ) and after which the Periphrastic Future तास् is always devoid of the augment इट् , थल् the personal-ending of the लिट् (Perfect Tense), like तास् does not get the augment इट् .
Word by word (padaccheda)
Right context उपदेशे saptamī · ekavacanaLeft context अत्वतः pañcamī · 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.
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Full reading
उपदेशे अत्वतः
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
After a root which possesses a short अ as its root-vowel in the original enunciation (the धातुपाठ) and after which the Periphrastic Future तास् is always devoid of the augment इट् , थल् the personal-ending of the लिट् (Perfect Tense), like तास् does not get the augment इट् ।
As Future पक्ता, Periphrastic पपक्थ, यष्टा, इयष्ट, शक्ता, शशक्थ ॥ Why do we say 'in the Original Enunciation'? Observe Future कर्ष्टा Periphrastic चकर्षिथ in which the अ of 'karsh' is the result of guna substitution. Why do we say 'having an अ'? Observe Future भेत्ता Periphrastic बिभेविथ, here the root-vowel is इ ॥ Why do we say "short अ"? Observe Future राद्धा Periphrastic रराधिथ from राध् the root-vowel being long आ ॥ The word तास्वत् is understood here also. Therefore we have जिघृक्षति, जिग्रहिथ ॥ Here the root ग्रह is anit before सन् 7.2.12 and not before तास् so it will not be anit before थ ॥ The words नित्यम् अनिटः are also understood here. Therefore the rule does not apply to आनञ्जिथ 7.4.71, 7.4.72. For the root अञ्जू (VII.21) takes optionally इट् before तास् 7.2.44 as अञ्जिता and अङ्क्ता ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.