Mbh 12.319.6a

"'"Yajnavalkya continued, 'Having said those words, the prince of Gandharvas proceeded towards heaven, shining in resplendence of beauty. Before leaving me, the high-souled one duly honoured me by taking the accustomed turns round my person, and I looked upon him, highly pleased. He inculcated the science he had obtained from me unto those celestials that dwell in the regions of Brahman and other deities, unto those that dwell on Earth, unto also the denizens of the nether regions, and unto them that had adopted the path of Emancipation, O king. The Sankhyas are devoted to the practices of their system. The Yogins are devoted to the practices inculcated by their system. Others there are that are desirous of achieving their Emancipation. Unto these latter this science is productive of visible fruits, O lion among kings. Emancipation flows from Knowledge. Without Knowledge it can never be attained. The wise have said it, O monarch. Hence, one should strive one's best for acquiring true Knowledge in all its details, by which one may succeed in freeing oneself from birth and death. Obtaining knowledge from a Brahmana or a Kshatriya or Vaisya or even a Sudra who is of low birth, one endued with faith should always show reverence for such knowledge. Birth and death cannot assail one that is endued with faith. All orders of men are Brahmanas. All are sprung from Brahma. All men utter Brahma.[1674] Aided by an understanding that is derived from and directed to Brahma, I inculcated this science treating of Prakriti and Purusha. Indeed, this whole universe is Brahma. From the mouth of Brahma sprung the Brahmanas; from his arms, sprung the Kshatriyas; from his navel, the Vaisya; and from his feet, the Sudras. All the orders, (having sprung in this way) should not be regarded as pilfering from one another. Impelled by Ignorance, all men meet with death and attain, O king, to birth that is the cause of acts.