पथः पन्थ च

Operational rule vidhi

The affix वुञ् comes after the word पथ , in the sense of 'produced therein' and thereby in the room of पथ , the substitute is पन्थ.

Word by word (padaccheda)

Target पथः ṣaṣṭhī · ekavacanaWord पन्थ Indeclinable च avyaya

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Word Case not marked in the source data.
Indeclinable An avyaya such as च "and", वा "optionally", न "not".

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Full reading

पथः पन्थ च

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

Commentary

The affix वुञ् comes after the word पथ , in the sense of 'produced therein' and thereby in the room of पथ , the substitute is पन्थ।
Thus पथि जातः = पन्थकः 'produced in the way.'

This debars the अण् ॥

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