इदन्तो मसि

Operational rule vidhi

The personal ending मस् becomes in the छन्दस् (Vedas) मसि ending with a इ.

Word by word (padaccheda)

Substitute / term इदन्तः prathamā · ekavacanaWord मसि

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Word Case not marked in the source data.

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Full reading

इदन्तः मसि

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

Commentary

The personal ending मस् becomes in the छन्दस् (Vedas) मसि ending with a इ।
Thus पुनस्त्वां दीपयामसि (for दीपयामः) शलभं भञ्जयामसि (for भञ्जयामः), त्वयि रात्रिं वासयामसि for वासयामः ॥

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