Mahabharata 12.321.26

12.321.26

pitā mātā ca sarvasya jagataḥ śāśvato guruḥ |
kaṃ tvadya yajase devaṃ pitaraṃ kaṃ na vidmahe || 26 ||

"Narada said, In the Vedas and the Puranas, in the Angas and the subsidiary Angas thou art sung with reverence, thou art unborn and eternal. Thou art the Creator. Thou art the mother of the universe. Thou art the embodiment of Immortality and thou art the foremost of all things. The Past and the Future, indeed, the entire universe has been established on thee! The four modes of life, O lord, having the domestic for their first, ceaselessly sacrifice to thee that art of diverse forms. Thou art the father and the mother and the eternal preceptor of the universe. We know not who is that deity or that Pitri unto whom thou art sacrificing to-day!