सद्भावे साधुभावे च सदित्येतत्प्रयुज्यते।प्रशस्ते कर्मणि तथा सच्छब्दः पार्थ युज्यते
sad-bhāve sādhu-bhāve cha sad ity etat prayujyate praśhaste karmaṇi tathā sach-chhabdaḥ pārtha yujyate
Sat' means Reality or the highest Good, and also, O Arjuna, it is used to denote an action of exceptional merit.
Translated by Shri Purohit Swami
The word "Sat" is used to refer to reality and goodness; likewise, O Arjuna, the word "Sat" is used to refer to an auspicious act.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
sat-bhāve—with the intention of eternal existence and goodness; sādhu-bhāve—with auspicious intention; cha—also; sat—the syllable Sat; iti—thus; etat—this; prayujyate—is used; praśhaste—auspicious; karmaṇi—action; tathā—also; sat-śhabdaḥ—the word “Sat”; pārtha—Arjun, the son of Pritha; yujyate—is used;