बहुलं छन्दसि

Operational rule vidhi

In the छन्दस् (Vedas) the substitution takes place diversely.

Word by word (padaccheda)

Substitute / term बहुलम् prathamā · ekavacanaRight context छन्दसि saptamī · ekavacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
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

बहुलम् छन्दसि

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

Commentary

In the छन्दस् (Vedas) the substitution takes place diversely.
That is ऐस् is substituted for भिस् even after stems which do not end in short अ; as नद्यः; and some times the substitution does not take place even after stems ending in short अ, as, देवेभिः सर्वेभिः प्रोक्तम् ॥ देवो देवोभिरागमत् (Rig Veda I.1.4).

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