वा छन्दसि

Operational rule vidhi

In the context of वेदाः, the 'हि' आदेश given to the सिप्-प्रत्यय of लोट्-लकार could be seen considered as पित्.

Word by word (padaccheda)

Indeclinable वा avyayaRight context छन्दसि saptamī · ekavacana

Indeclinable An avyaya such as च "and", वा "optionally", न "not".
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

वा 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 substitute of हि is optionally treated as not having an indicatory प्।
The result is that in the Chhandas the second person singular of लोट् has two forms as प्रीणाहि or प्रीणीहि; युयुधि or युयोधि, धि being substituted for हि in the Vedas, by rule 6.4.103 as in the following verse:

अग्ने॒ नय॑ सु॒पथा॑रा॒येऽअ॒स्मान्विश्वा॑निदेव व॒यूना॑निविद्वा॒न् ।
यु योध्य॒स्मज्जु॑हुरा॒णमेनो॒भूयि॑ष्ठान्ते॒ नमाऽउक्तिम्विधेम ॥

--Rig 1.189. 1: Yajur Veda. 40.16.

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