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य एव सत्यान्नापैति स ज्ञेयो ब्राह्मणस्त्वया ॥
In plain words
The one who never steps away from truth — him, and only him, you should recognize as a brāhmaṇa.
Close to the Sanskrit
He who indeed does not depart from truth — he is to be known by you as a brāhmaṇa.