लभेश्च

Operational rule vidhi

The verb root लभ् which is followed by an अजादि प्रत्यय gets a नुमागम. But this नुमागम is not seen in presence of शप् विकरणप्रत्यय as well as in presence of लिट्-लकार.

Word by word (padaccheda)

Target लभेः ṣaṣṭhī · ekavacanaIndeclinable च avyaya

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

Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.

Full reading

लभेः च

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

Commentary

So also लभ् 'to get' before an affix beginning with a vowel with the exception of शप् and लिट् , there is no augment नुम् ।
As लम्भयति, लम्भकः, साधुलम्भी, लम्भंलम्भम्, लम्भो वर्तते ॥ But लभते with शप्, and लेभे in the Perfect, and लब्धा before an affix beginning with a consonant. The separation of this from the last, is for the sake of the subsequent aphorisms.

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