Chāndogya Upaniṣad 4.6.4

4.6.4

sa ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇo 'nantavān ity upāste anantavān asmiṃl loke bhavati \
anantavato ha lokāñ jayati ya etam evaṃ vidvāṃś catuṣkalaṃ pādaṃ brahmaṇo 'nantavān ity upāste \\406.4\

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