Chandogya Upanishad
Prapathaka III, Khanda 3
The western rays of the sun are the honey-cells behind. The Sâman verses are the bees, the Sâma-veda sacrifice is the flower, the water is the nectar.
Those very Sâman verses (as bees) brooded over the Sâma-veda sacrifice; and from it, thus brooded on, sprang as its (nectar) essence, fame, glory of countenance, vigour, strength, and health.