Sanskrit
तदित्यनभिसन्धाय फलं यज्ञतपःक्रियाः । दानक्रियाश्च विविधाः क्रियन्ते मोक्षकाङ्क्षिभिः ॥
tad ity anabhisandhāya phalaṃ yajñatapaḥkriyāḥ dānakriyāś ca vividhāḥ kriyante mokṣakāṅkṣibhiḥ
Translation
With the pronunciation of "Tat" and without aiming at fruit are performed the various acts of sacrifice, austerity and gift, by those desiring liberation.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
“Tat” marks the acts done by those seeking mokṣa, liberation, and — not coincidentally — it’s paired here with the exact non-attachment (anabhisandhāya phalam) that defined sattvic sacrifice in verse 11 and sattvic austerity in verse 17. The three-verse Om Tat Sat sequence is effectively re-deriving the chapter’s entire sattva standard through the lens of the mantra: Om for the willingness to begin, Tat for release from the fruit, and next, Sat for the quality of the act itself.