Chandogya Upanishad 4.5

4.5.1

atha ha enam ṛṣabho 'bhyuvāda satyakāma3 iti \
bhagava iti ha pratiśuśrāva \
prāptāḥ somya sahasraṃ smaḥ \
prāpaya na ācāryakulam \\405.1\

then the bull spoke to him, saying: ‘Satyakāma!’ ‘Sir!’ he replied. ‘We have reached a thousand, my dear. Bring us to the teacher’s house. And let me tell you a quarter of Brahma.’ ‘Tell me, Sir.’ To him it then said: ‘One sixteenth is the east. One sixteenth is the west. One sixteenth is the south. One sixteenth is the north. This, verily, my dear, is the quarter of Brahma, consisting of four sixteenths, named the Shining.

4.5.2

brahmaṇaś ca te pādaṃ bravāṇi iti \
bravītu me bhagavān iti \
tasmai ha uvāca \
prācī dik kalā \
praticī dik kalā \
dakṣiṇā dik kalā \
udīcī dik kalā \
eṣa vai somya catuṣkalaḥ pādo brahmaṇaḥ prakāśavān nāma \\405.2\

4.5.3

sa ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇaḥ prakāśavān ity upāste prakāśavān asmiṃl loke bhavati \
prakāśavato ha lokāñ jayati ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇaḥ prakāśavān ity upāste \\405.3\

3. He who, knowing it thus, reverences a quarter of Brahma, consisting of four sixteenths, as the Shining, becomes shining in this world. Then he wins shining worlds who, knowing it thus, reverences a quarter of Brahma, consisting of four sixteenths, as the Shining.