KAṬHA UPANISHAD · 1.3.8

यस्तु विज्ञानवान्भवति समनस्कः सदा शुचिः ।
स तु तत्पदमाप्नोति यस्माद्भूयो न जायते ॥ ८॥

yastu vijñānavānbhavati samanaskaḥ sadā śuciḥ ।
sa tu tatpadamāpnoti yasmādbhūyo na jāyate ॥ 8॥

But he that has knowledge and is mindful and pure always, reaches that goal whence he is not born again.