सत्यादशपथे

Operational rule vidhi

The affix डाच् comes after the word सत्य followed by कृ 'to make' when not meaning 'to swear'.

Word by word (padaccheda)

Left context सत्यात् pañcamī · ekavacanaRight context अशपथे saptamī · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
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").

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Full reading

सत्यात् अशपथे

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

Commentary

The affix डाच् comes after the word सत्य followed by कृ 'to make' when not meaning 'to swear'.
The word सत्य means 'truth' as opposed to 'falsehood'. Sometimes it means to swear, as in the sentence "सत्येन शापयेद् विप्रम्" ॥ This latter sense is prohibited. Thus सत्या करोति वनिक् भाण्डम् "the merchant concludes the bargain of the goods i. e. he settles that he will purchase these wares". Why do we say 'when not meaning to swear'? Observe सत्यं करोति ब्राह्मणः "the Brahmana swears".

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