तुभ्यमह्यौ ङयि

Operational rule vidhi

In the Dative -4th Case singular तुभ्य is substituted for युष्म् and मह्य for अस्म्.

Word by word (padaccheda)

Substitute / term तुभ्यमह्यौ prathamā · dvivacanaRight context ङयि 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

तुभ्यमह्यौ ङयि

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

Commentary

In the Dative -4th Case singular तुभ्य is substituted for युष्म् and मह्य for अस्म्।
As तुभ्यम्, मह्यम्, परमतुभ्यम्, परममह्यम्, अतितुभ्यम्, अतिमह्यम् ॥

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