Sanskrit
ओं तत्सदिति निर्देशो ब्रह्मणस्त्रिविधः स्मृतः ।ब्राह्मणास्तेन वेदाश्च यज्ञाश्च विहिताः पुरा ॥
Transliteration
oṃ tatsaditi nirdeśo brahmaṇastrividhaḥ smṛtaḥ brāhmaṇāstena vedāśca yajñāśca vihitāḥ purā
Translation
"Aum Tat Sat," this has been considered to be the threefold designation of the Eternal. By that were ordained of old Brâhmanas, Vedas and sacrifices.