6.3.3
ओजःसहोऽम्भस्तमसः तृतीयायाः
Operational rule vidhi
The Instrumental -3rd case endings after 1. ओजस् 2. सहस् 3. अम्भस् and 4. तमस् are not elided before the second member of a compound.
Word by word (padaccheda)
Left context ओजस्- सहस्- अम्भस्- तमसः pañcamī · ekavacanaTarget तृतीयायाः ṣaṣṭhī · ekavacana
- Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
- Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).
Full reading
ओजस्-
Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.
Commentary
The Instrumental -3rd case endings after 1. ओजस् 2. सहस् 3. अम्भस् and 4. तमस् are not elided before the second member of a compound.
Thus ओजसाकृतम्, सहसाकृतम्, अम्भसाकृतम्, तमसाकृतम् ॥
Vart:- अञ्जस् also should be enumerated. Thus अञ्जसाकृतम् ॥
Vart:- The compounds पुंसानुजः and जनुषान्धः should also be mentioned. Thus पुंसा हेतुनानुजः = पुंसानुजः ॥ जनुषा हेतुनाऽन्धः = जनुषान्धः ॥ The word जनु is another name of जन्मन् 'birth'.
Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.