Chandogya Upanishad
Prapathaka III, Khanda 2
The southern rays of the sun are the honey-cells on the right. The Yagus verses are the bees, the Yagur-veda sacrifice is the flower, the water (of the sacrificial libations) is the nectar (of the flower).
Those very Yagus verses (as bees) brooded over the Yagur-veda sacrifice (the flower); and from it, thus brooded on, sprang as its (nectar) essence, fame, glory of countenance, vigour, strength, and health.