That’s very interesting to open up to the brahmanic perspective! a while ago I looked up the veda references in the suttas in a discussion. And it’s rather save to say that the first three vedas were known in the Buddha’s time, whereas the fourth veda appeared shortly after as a clear reference, a Snp verse and more clearly in the Milindapanha. Maybe there are articles about indriya in the vedas-upanishads somewhere?
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