दयतेर्दिगि लिटि

Operational rule vidhi

दिगि is substituted for दे (दयते) in the लिट् (Perfect Tense).

Word by word (padaccheda)

Target दयतेः ṣaṣṭhī · ekavacanaWord दिगि Right context लिटि saptamī · ekavacana

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.
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

दयतेः दिगि लिटि

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

Commentary

दिगि is substituted for दे (दयते) in the लिट् (Perfect Tense).
As अव दिग्ये, अव दिग्याते, अव दिग्यिर ॥ The root देङ् 'to protect' (Bhuadi 1011) is to be taken, and not दय 'to give' (Bhuadi 510), for that root forms its Perfect by आम् (Periphrastic Perfect) as taught in 3.1.37. The substitute दिगि debars reduplication.

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