7.4.52
ह एति
Operational rule vidhi
The स् of तास् (the character of the second future) and अस् 'to be' is substituted ह् before the personal-ending ए.
Word by word (padaccheda)
Substitute / term हः prathamā · ekavacanaRight context एति saptamī · ekavacana
- Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
- 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
हः एति
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The स् of तास् (the character of the second future) and अस् 'to be' is substituted ह् before the personal-ending ए।
As कर्त्ताहे, and व्यति हे from अस् ॥ See 6.4.111. The ह substitution does not take place before the Personal ending एश् 3.4.8, as एधामासे ॥ The reason of this is that the ए referred to in this sutra, is that ए which can come after तास्; and that very ए should also come after अस् ॥ The ए that can come after तास् is the Ist Person singular ए; and not this ए of the Perfect 3rd Person singular. Others say, this even sarvadhatuka, and therefore not here सुप्तोऽहं त्वां प्रेक्षामासे ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.