Chandogya Upanishad 4.7.4

4.7.4

sa ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇo jyotiṣmān ity upāste jyotiṣmān asmiṃl loke bhavati \
jyotiṣmato ha lokāñ jayati ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇo jyotiṣmān ity upāste \\407.4\

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