Bhagavad Gita Bhashya (Adi Shankaracharya) 9.17

9.17 Asya, of this; jagatah, world; aham, I; am pita, the father; mata, the mother; dhata, ordainer, dispenser of the results of their actions to the creatures; (and the) pirtamahah, grand-father. I am the vedayam, knowable-that which has to be known; the pavitram, sanctifier; [Virtuous actions.] and the onkarah, syllable Om; eva ca, as also Rk, Sama and Yajus. [Brahman, which has to be known, is realizable through Om, regarding which fact the three Vedas are the authority. The ca (as also) is suggestive of the Atharva-veda.] Moreover,