Overview
Om Tat Sat is a short phrase used to close a piece of ritual or devotional action — a sacrifice, an austerity, a gift, or, by extension, a piece of writing or correspondence — rather than one recited repeatedly in japa. It names, in three words, what the Bhagavad Gita calls the threefold designation of Brahman: not a mantra addressed to a particular deity, but a way of marking an act as offered toward ultimate reality itself.
Origin and source
Om Tat Sat is named and explained directly in the Bhagavad Gita, chapter 17, verses 23 through 28 — Krishna’s teaching to Arjuna near the close of their dialogue. Verse 17.23 states it plainly: oṃ tat sad iti nirdeśo brahmaṇas tri-vidhaḥ smṛtaḥ, “Om Tat Sat is remembered as the threefold designation of Brahman,” adding that by this designation the brahmins, the Vedas, and sacrifices were ordained of old.
The following verses explain each word’s traditional use. Om, the Gita says, is uttered at the start of acts of sacrifice, giving, and austerity by those who speak of Brahman, as the scriptures prescribe (17.24). Tat, “that,” is used by seekers of liberation who carry out sacrifice, austerity, and giving without fixing their aim on the fruit of the act (17.25). Sat is applied to what is real and good — to existence and to virtue — and is likewise used of praiseworthy acts of sacrifice, austerity, and giving, as well as to steadfastness in purpose tied to such acts (17.26–27). The Gita closes the passage by contrast: whatever is offered, given, or undertaken without faith is called asat, “not real” or “not so,” and Krishna says it counts for nothing, in this life or after (17.28).
Word-by-word meaning
Tap a word to see what it means and where it sits in the verse.
Om — the primordial syllable; the Gita describes it as what brahma-vādins (those who speak of and teach Brahman) invoke at the start of Vedic rites, recitations, and acts of giving
| Sanskrit | IAST | Meaning |
|---|---|---|
| ॐ | oṃ | Om — the primordial syllable; the Gita describes it as what brahma-vādins (those who speak of and teach Brahman) invoke at the start of Vedic rites, recitations, and acts of giving |
| तत् | tat | "that" — used, per the Gita, by seekers of liberation who perform sacrifice, austerity, or giving without fixing their aim on the result |
| सत् | sat | "being," "existence," "the real" — applied, per the Gita, to what is good and steadfast, and to praiseworthy acts of sacrifice, austerity, and giving |
Meaning of the whole
Read as the Gita presents it, Om Tat Sat is not a request but a seal placed on an action, marking it as directed toward Brahman rather than toward its own reward. Om opens the act in the manner of Vedic recitation; Tat detaches the act from its fruit, offering it toward “that” rather than toward personal gain; Sat affirms the act as real, good, and worth standing behind. Together, the three words designate Brahman under three aspects — as invoked at the start, as the “that” toward which action is offered without attachment, and as the ground of what is true and steadfast.
How it is recited
Om Tat Sat is traditionally spoken at the close of a ritual act — a sacrifice, an austerity, or an act of giving — rather than counted through repetition on a mala. In wider devotional and everyday use, it has also come to serve as a closing phrase for a piece of writing, a letter, or a spoken teaching, marking what precedes it as offered in the spirit the Gita describes.
