कृषेश्छन्दसि

Operational rule vidhi

The Palatal is not substituted for the Guttural of the reduplicate of कृष् 'to draw' in the छन्दस् (Vedas) when in the Intensive.

Word by word (padaccheda)

Target कृषेः ṣaṣṭhī · ekavacanaRight context छन्दसि saptamī · ekavacana

Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
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

कृषेः छन्दसि

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

Commentary

The Palatal is not substituted for the Guttural of the reduplicate of कृष् 'to draw' in the छन्दस् (Vedas) when in the Intensive.
As करीकृष्यते यज्ञकुणपः; otherwise चरीकृष्यते कृषीवलः ॥

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