Chandogya Upanishad
Prapathaka III, Khanda 1
The sun is indeed the honey of the Devas. The heaven is the cross-beam (from which) the sky (hangs as) a hive, and the bright vapours are the eggs of the bees .
The eastern rays of the sun are the honey-cells in front. The Rik verses are the bees, the Rig-veda (sacrifice) is the flower, the water (of the sacrificial libations) is the nectar (of the flower).
Those very Rik verses then (as bees) brooded over the Rig-veda sacrifice (the flower); and from it, thus brooded on, sprang as its (nectar) essence, fame, glory of countenance, vigour, strength, and health .