Upaniṣads · Bṛhadāraṇyaka 5.4

Bṛhadāraṇyaka 5.4.1

(हृदयब्रह्मणः सत्यमित्युपासनाविधिब्राह्मणम् )
तद्वै तदेतदेव तदास ।
सत्यमेव ।
स यो हैतं महद्यक्षं प्रथमजं वेद सत्यं ब्रह्मेति जयतीमांल्लोकान् जित इन्न्वसावसत् य एवमेतन्महद्यक्षं प्रथमजं वेद सत्यं ब्रह्मेति ।
सत्यं ह्येव ब्रह्म ॥ ५.४.१ ॥

Indeed, that was just what it was. It was truth. He who knows this great adorable power, the first-born, as 'truth is brahman' conquers these worlds; he becomes one who has already conquered. Thus, he who knows this great adorable power, the first-born, as 'truth is brahman'. Truth indeed is brahman.