समानतीर्थे वासी

Operational rule vidhi

The affix यत् comes in the sense of 'resident therein' after the word समानतीर्थ in the Locative -7th case construction.

Word by word (padaccheda)

Right context समानतीर्थे saptamī · ekavacanaSubstitute / term वासी prathamā · 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").
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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Full reading

समानतीर्थे वासी

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

Commentary

The affix यत् comes in the sense of 'resident therein' after the word समानतीर्थ in the Locative -7th case construction.
The anuvritti of साधुः now ceases. The word तीर्थ means here गुरु 'Preceptor'. Thus समाने तीर्थे वासी = सतीर्थ्यः 6.3.87-- 'a fellow-student', who both dwell under the same preceptor.

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