1.3.20 आङो दोऽनास्यविहरणे

Word by word (padaccheda)

Left context आङः pañcamī · ekavacanaLeft context दः pañcamī · ekavacanaRight context अनास्यविहरणे 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

आङः दः अनास्यविहरणे

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

Commentary

After the verb दा 'to give', preceded by अङ् , and when not meaning 'to open the mouth', the आत्मनेपद affix is used, even when the fruit of the action does not accrue to the agent.
The root दा is generally both Parasmaipadi and Atmanepadi (see Sutra. 72). But when preceded by the preposition आ, it is restriced to the atmanepada As विद्यामादत्ते 'he acquires knowledge.' But when it means "to widen the mouth" whether actually or metaphorically, it is parasmaipadi. As आस्यं व्याददाति. 'He expands his own mouth.'

Vart:- The prohibition also applies when the action is similar to the act of opening the mouth. As विपादिकां व्याददाति 'he opens the tumour.' कूलं व्याददाति नदी 'the river breaks the bank.'

Vart:- When the action does not affect the agents' own body the verb is atmanepadi, as व्याददतेपिपीलिकाः पतंगस्य मुखम्, 'the ants open the mouth of a locust.'

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