2.3.70
अकेनोर्भविष्यदाधमर्ण्ययोः
Operational rule vidhi
The 6th-Case-affix is not used when the word is governed by a verbal noun in अक denoting futurity, or in a इन् denoting 'futurity and indebtedness'.
Word by word (padaccheda)
Target अक- इनोः ṣaṣṭhī · dvivacanaRight context भविष्यत्- आधमर्ण्ययोः saptamī · dvivacana
- 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").
Full reading
अक-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The 6th-Case-affix is not used when the word is governed by a verbal noun in अक denoting futurity, or in a इन् denoting 'futurity and indebtedness'.
The affix अक, such as ण्वुल, वुञ् &c., denote futurity, and never denote indebtedness. The affix इन् such as णिनि 3.3.3 and 3.3.170 denotes both. Thus कटं कारको व्रजति 'he goes to make a mat.' ओदनं भोजको व्रजति 'he goes to eat rice.' So also with इन्, as ग्रामंगमी or ग्रामी 'he has to go to the village.' शतं दायी 'he owes hundred.'
Why do we say 'when denoting futurity or indebtedness' ? Observe यवानां लावकः 'the cutter of barley.' सक्तूनां पावकः, अवश्यं करी कटस्य ॥
Why is the Genitive employed in the following वर्षशतस्य पूरकः, पुत्रपौत्राणां दर्शकः ? The words पूरक and दर्शक, though formed by अक 3.1.133, are not formed by that अक which denotes futurity, viz., (II . 3.10). The present sutra relates to this latter अक, and not every अक in general.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.