CHĀNDOGYA UPANISHAD · 2.23.1

त्रयो धर्मस्कन्धाः ।
यज्ञो ऽध्ययनं दानम् इति प्रथमः ।
तप एव द्वितीयः ।
ब्रह्मचार्याचार्यकुलवासी तृतीयो ऽत्यन्तम् आत्मानम् आचार्यकुले ऽवसादयन् ।
सर्व एते पुण्यलोका भवन्ति ।
ब्रह्मसंस्थो ऽमृतत्वम् एति ॥

trayo dharmaskandhāḥ ।
yajño ’dhyayanaṃ dānam iti prathamaḥ ।
tapa eva dvitīyaḥ ।
brahmacāryācāryakulavāsī tṛtīyo ’tyantam ātmānam ācāryakule ’vasādayan ।
sarva ete puṇyalokā bhavanti ।
brahmasaṃstho ’mṛtatvam eti ॥

There are three branches of the law. Sacrifice, study, and charity are the first, Austerity the second, and to dwell as a Brahmakârin in the house of a tutor, always mortifying the body in the house of a tutor, is the third. All these obtain the worlds of the blessed; but the Brahmasamstha alone (he who is firmly grounded in Brahman) obtains immortality.

F. Max Müller · The Upanishads, Sacred Books of the East 1 (1879)