अपह्नवे ज्ञः

Operational rule vidhi

After the verb ज्ञ , when used in the sense of 'denying', the आत्मनेपद is used.

Word by word (padaccheda)

Right context अपह्नवे saptamī · ekavacanaLeft context ज्ञः 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

अपह्नवे ज्ञः

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 ज्ञ , when used in the sense of 'denying', the आत्मनेपद is used.
The root jna which ordinarily means 'to know' and is parasmaipadi by rule 1.3.78, becomes Atmanepadi when through the virtue of any prefix it means 'to deceive:' as अपजानीते 'he deceives,' शतमपजानीते 'he denies the debt of a hundred rupees,' सहस्रमपजानीते 'denies a thousand.'

Why do we say when meaning "to deny ?" Observe:- न त्वं किंचिदपि ज्ञानासि 'thou knowest not anything.'

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