Om, Tad, and Sat, this is said (to be) the threefold designation of the Brahman. By that, the Brahmanas and the Vedas and sacrifices were created in olden times. Hence, the performance by those who study the Brahman, of sacrifices, gifts, and penances, prescribed by the ordinances (of scripture, always commence after saying `Om.' Those who desire final emancipation perform the various acts of sacrifice and penance, and the various acts of gift, without expectation of fruit, after (saying) `Tad.'