वेः स्कभ्नातेर्नित्यम्

Operational rule vidhi

ष् is always the substitute of the स् of स्कम्भ after the उपसर्ग (Preposition) वि.

Word by word (padaccheda)

Left context वेः pañcamī · ekavacanaTarget स्कभ्नातेः ṣaṣṭhī · ekavacanaTarget नित्यम् ṣaṣṭhī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

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वेः स्कभ्नातेः नित्यम्

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

ष् is always the substitute of the स् of स्कम्भ after the उपसर्ग (Preposition) वि।
Thus विष्कभ्नाति, विष्कम्भिता, विष्कम्भितुम्, विष्कम्भितव्यम् ॥

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