6.4.49
यस्य हलः
Operational rule vidhi
When a consonant precedes the final य in a verbal अङ्ग (stem) this य is also elided before an आर्धधातुक affix.
Word by word (padaccheda)
Target यस्य ṣaṣṭhī · ekavacanaLeft context pañcamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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Full reading
यस्य
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
When a consonant precedes the final य in a verbal अङ्ग (stem) this य is also elided before an आर्धधातुक affix.
Thus बेभिदिता, बेभिदितुम्, बेभिदितव्यम् from the Intensive stern बेभिद्य ॥ In the sutra यस्य is given, which is the Genitive singular of य namely of the letters य् अ ॥ By the rule of अलोऽन्त्यस्य 1.1.52, the अ of य ought to be elided and not य्; but that rule is evidently inapplicable here, since the elision of अ would have taken place by the preceding rule : the present rule therefore teaches the elision of य (ya). Or the word हलः may be considered as in the ablative case, and then by 1.1.54, the first letter would be elided namely य ॥ Why have we taken [the two letters (संघात) conjointly viz.] य and not य्? Observe ईर्ष्यिता, मव्यिता, शुच्यिता from the simple roots ईर्ष्य्, मव्य्, and शुच्य् ॥ Here य् not being followed by अ, is not elided (see Bhvadi 541-546). Why do we say "when preceded by a consonant?" Observe लोलूयिता, पोपूयिता ॥
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.