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Ṛgveda 10.164

एकं सद् विप्रा बहुधा वदन्ति अग्निं यमं मातरिश्वानम् आहुः ॥

There is only one ultimate supreme reality (sat), which sages address by different names like Agni, Yama, Matarishvan, Vayu.

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