तस्य तात्

Operational rule vidhi

For the ending त of the 2nd person plural Imperative is substituted तात् in the छन्दस् (Vedas).

Word by word (padaccheda)

Target तस्य ṣaṣṭhī · ekavacanaLeft context तात् 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

तस्य तात्

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

Commentary

For the ending त of the 2nd person plural Imperative is substituted तात् in the छन्दस् (Vedas).
As गात्रं गात्रमस्या नूनं कृणुतात् (or कृणुत), and ऊवध्ये गोहं पार्थिवं खनतात् (for खनत) Aitareya Brahmana II.6.15, 16. अस्मारक्ष संसृजतात् (= संसृजत), सूर्यं चक्षुर्गमयतात् (= गमयत).

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.