trayyā
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by followers of the three Vedas who perform great sacrifices like Indra and other demigods — Antya 7.33
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by followers of three Vedas who perform great sacrifices (like the demigod Indra) — Madhya 19.204
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by studying the three Vedas (Sāma, Yajur and Atharva) — SB 10.8.45
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following the Vedic principles — SB 9.14.46
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having three divisions — SB 5.22.4
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the three Vedas — SB 7.3.30
trayyā vidyayā
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by performing ritualistic ceremonies according to Vedic principles — SB 5.20.3-4