6.1.56
बिभेतेर्हेतुभये
Operational rule vidhi
There is optionally the substitution of आ in the room of the diphthong of the root भी 'to fear' in the causative, when the fear is produced directly through the agent of the causative.
Word by word (padaccheda)
Target बिभेतेः ṣaṣṭhī · ekavacanaRight context हेतुभये saptamī · ekavacana
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
- 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").
Dotted words are technical terms, dashed ones pratyāhāras (names for classes of sounds or affixes). Hover or tap one to see its card.
Full reading
बिभेतेः हेतुभये
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
There is optionally the substitution of आ in the room of the diphthong of the root भी 'to fear' in the causative, when the fear is produced directly through the agent of the causative.
The words णौ and विभाषा are understood here. The word हेतु in the sutra is the technical हेतु meaning स्वतन्त्रस्य प्रयोजक 1.4.54 and 1.4.55. When the Hetu Agent himself is directly the cause of the fear, that fear is called the हेतुभय "the fear caused by the Hetu". Thus मुण्डो भापयते 7.3.36 or भीषयते 7.3.40. So also जटिलो भापयते or भीषयते ॥ This root takes the affixes of the Atmanepada, by 1.3.68; and the augment ष is added by 7.3.40, which does not come when there is आ substitution, for the भी in 7.3.40 is equal to भ् + ई i.e. भी ending in ई; and means भी ending in ई takes the augment ष ॥
Why do we say 'when the agent of the causative is the producer of the fear'? Observe कुञ्चिकयैनं भाययति देवदत्तः ॥ Here the fear is produced from the कुञ्चिका and not from Devadatta the Agent.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.