देवतान्तात्तादर्थ्ये यत्

Operational rule vidhi

After a stem ending in the word देवता being in the Dative -4th Case in construction comes the affix यत् (यं) in the sense of 'appointed for it'.

Word by word (padaccheda)

Left context देवतान्तात् pañcamī · ekavacanaRight context तादर्थ्ये saptamī · ekavacanaSubstitute / term य prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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").
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

Dotted words are technical terms. Hover or tap one to see its card.

Pink letters are it-markers (anubandhas), tags dropped by 1.3.9. Hover or tap one for the rule that marks it, or try the it-letter finder.

Full reading

देवतान्तात् तादर्थ्ये यत्

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

Commentary

After a stem ending in the word देवता being in the Dative -4th Case in construction comes the affix यत् (यं) in the sense of 'appointed for it'.
The word तादर्थ्यम् has the same meaning as तदर्थ "for the sake of that" 2.1.37. Thus अग्निदेवतायै इदम् = अग्निदेवत्यम् "offering &c, sacred to Agni". So also पितृदेवत्यम्, वायुदेवत्यम् ॥

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