Khandogya-Upanishad: Second Prapathaka, Sixth Khanda

1. Let a man meditate on the fivefold Saman in animals. The hinkara is goats, the prastava sheep, the udgitha cows, the pratihara horses, the nidhana man.

2. Animals belong to him, nay, he is rich in animals who knowing this meditates on the fivefold Saman as animals.