एर्लिङि

Operational rule vidhi

ए is substituted for the आ of the above roots (1. मा 2. स्था 3. गा 4. पा 5. हा (जुहाति) and 6. सा (सो)) in the Benedictive Mood Active.

Word by word (padaccheda)

Substitute / term एः prathamā · ekavacanaRight context लिङि 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

एः लिङि

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

ए is substituted for the आ of the above roots (1. मा 2. स्था 3. गा 4. पा 5. हा (जुहाति) and 6. सा (सो)) in the Benedictive Mood Active.
Thus देयात्, मेयात्, धेयात्, स्थेयात्, गेयात्, पेयात् and अवसेयात् ॥ Before non-कित् and non-ङित् we have दासीष्ट and धासीष्ट ॥ By the word लिङ् is here meant the आशीर्लिङ् or the Precative mood; the Personal endings of which mood are ardhadhatuka by 3.4.116. More-over by 3.4.104 the Parasmaipada affixes only of the Benedictive are कित्, so the present rule does not apply to the Atmanepada affixes of the Precative.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.