Chandogya Upanishad — Chapter 1: Prapathaka 1: Meditation on Om (Udgitha)
103 verses
Verse 1
Let a man meditate on the syllable Om, called the udgîtha; for the udgîtha (a portion of the Sâma-veda) is sung, beginning with Om.
Verse 2
The essence of all beings is the earth, the essence of the earth is water, the essence of water the plants, the essence of plants man, the essence o…
Verse 3
That udgîtha (Om) is the best of all essences, the highest, deserving the highest place, the eighth.
Verse 4
What then is the Rik? What is the Sâman? What is the udgîtha? This is the question.
Verse 5
The Rik indeed is speech, Sâman is breath, the udgîtha is the syllable Om. Now speech and breath, or Rik and Sâman, form one couple.