Khandogya-Upanishad: Second Prapathaka, Twenty-first Khanda
2. He who thus knows this Saman, as interwoven in everything, he becomes everything.
3. And thus it is said in the following verse: “There are the fivefold three (the three kinds of sacrificial knowledge, the three worlds &c. in their fivefold form, i.e. as identified with the hinkara, the prastiva, &c.), and the other forms of the Saman. Greater than these there is nothing else besides.”
4. He who knows this, knows everything. All regions offer him gifts. His rule is, “Let him meditate (on the Saman), knowing that he is everything, yea, that he is everything.”