17.23 Om, tat, sat-iti, this; is smrtah, considered, regarded, in the Vedanta, by the knowers of Brahman; to be the trividhah, threefold; nirdesah, designation, mention by name-nirdesa is that by which a thing is specified; brahmanah, of Brahman. The Brahmanas and the Vedas and the sacrifices were vihitah, ordainded, [When some defect arises in sacrifice etc., then this is corrected by uttering one of these words-Om, tat, sat.] created; tena, by that threefold designation; pura, in the days of yore [In the beginning of creation by Prajapati.]-this is said by way of eulogizing the designation.