6.1.21
चायः की
Operational rule vidhi
The verb की is substituted for the verb चायृ 'to worship, to observe', when the Intensive affix यङ् follows.
Word by word (padaccheda)
Target चायः ṣaṣṭhī · ekavacanaWord की
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Word Case not marked in the source data.
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Full reading
चायः की
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The verb की is substituted for the verb चायृ 'to worship, to observe', when the Intensive affix यङ् follows.
The phrase यङि is understood here. Thus चेकीयते, चेकीयेते, चेकीयन्ते ॥ The exhibition of की in the sutra with a long ई indicates that there is long vowel even in tenses where यङ् is elided, as चेकीतः ॥ For if the sutra had enunciated कि with a short इ as the substitute of चाय्, the forms चेकीयते &c would have been still valid. Thus कि + यङ् = चि + कि + य = चे + कि + य = चे + की + य 7.4.25 causing the lengthening of the short इ). But then the Nishtha would have been चेकितः which is wrong.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.