It was just through this knowledge that the great householders and great Vedic scholars of olden times declared: ’No one can now mention to us anything which we have not heard, thought of, or known.’ They knew all from these three forms.
Sama Veda, Chandogya Upanishad VI, IV – The Threefold Development further explained, 5
Whatever, appeared red they knew to be the colour of fire; whatever appeared white they knew to be the colour of water; whatever appeared black they knew to be the colour of earth. Whatever appeared to be unknown they knew to be the combination of these three deities (i.e. colours). Now learn from me, my dear, how these three deities, when they reach man, become each of them tripartite.
Sama Veda, Chandogya Upanishad VI, IV – The Threefold Development further explained, 6-7
Food when eaten becomes threefold. What is coarsest in it becomes feces, what is medium becomes flesh and what is subtlest becomes mind.
Sama Veda, Chandogya Upanishad VI, V – The Threefold Nature of Food, 1
Imparter of strength, come, take full possession, O Soma, light-finder, man’s constant overseer. Enlist your helpers, O Lord; place a guard on our lives both in front and behind to protect us.
Rig Veda VIII, 48, 15
Let them utter loud sounds! We too will utter! Give tongue, one and all, to the Stones who give tongue, when, O rocks, O mountains, swiftly clashing, you bring to God’s ears your rhythmic din.
Rig Veda X, 94, 1