अदः सर्वेषाम्

Operational rule vidhi

A सार्वधातुक-अपृक्त-प्रत्यय that follows the verb अद् gets an अट् आगम.

Word by word (padaccheda)

Left context अदः pañcamī · ekavacanaTarget सर्वेषाम् ṣaṣṭhī · bahuvacana

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).

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

अदः सर्वेषाम्

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

Commentary

After अद् 'to eat' , comes the augment अट् before a सार्वधातुक affix consisting of a single consonant, according to the opinion of all grammarians.
As आदत् and आदः ॥ Before a non-aprikta we have अत्ति, अत्सि ॥ The word सर्वेषाम् makes it a necessary rule and not optional, like the last.

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