Taittirīya Upaniṣad 1.9

1.9.1

ṛtaṃ ca svādhyāyapravacane ca /
satyaṃ ca svādhyāyapravacane ca /
tapaśca svādhyāyapravacane ca /
damaśca svādhyāyapravacane ca /
śamaśca svādhyāyapravacane ca /
agnayaśca svādhyāyapravacane ca /
agnihotraṃ ca svādhyāyapravacane ca /
atithayaśca svādhyāyapravacane ca /
mānuṣaṃ ca svādhyāyapravacane ca /
prajā ca svādhyāyapravacane ca /
prajanaśca svādhyāyapravacane ca /
prajātiśca svādhyāyapravacane ca /
satyamiti satyavacā rāthītaraḥ /
tapa iti taponityaḥ pauruśiṣṭiḥ /
svādhyāyapravacane eveti nāko maudagalyaḥ /
taddhi tapastaddhi tapaḥ // 1//
iti navamo 'nuvākaḥ //

The right (ṛta), and also study and teaching.
The true (satya), and also study and teaching.
Austerity (tapas), and also study and teaching.
Self-control (dama), and also study and teaching.
Tranquillity (śama), and also study and teaching.
The [sacrificial] fires, and also study and teaching.
The Agnihotra sacrifice, and also study and teaching.
Guests, and also study and teaching.
Humanity (mānuṣa), and also study and teaching.
Offspring, and also study and teaching.
Begetting, and also study and teaching.
Procreation, and also study and teaching.
‘The true!’—says Satyavacas (‘Truthful’) Rathītara.
‘Austerity!’—says Taponitya (‘Devoted-to-austerity’) Pauruśiṣhṭi.
‘Just study and teaching!’—says Nāka (‘Painless’) Maudgalya, ‘for that is austerity—for that is austerity.’