CHĀNDOGYA UPANISHAD · 3.1.2

तस्य ये प्राञ्चो रश्मयस् ता एवास्य प्राच्यो मधुनाड्यः ।
ऋच एव मधुकृतः ।
ऋग्वेद एव पुष्पम् ।
ता अमृता आपः ।
ता वा एता ऋचः ॥

tasya ye prāñco raśmayas tā evāsya prācyo madhunāḍyaḥ ।
ṛca eva madhukṛtaḥ ।
ṛgveda eva puṣpam ।
tā amṛtā āpaḥ ।
tā vā etā ṛcaḥ ॥

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).

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)