Chandogya Upanishad 4.5.3

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.