Chāndogya Upaniṣad 4.6.3

4.6.3

brahmaṇaḥ somya te pādaṃ bravāṇīti \
bravītu me bhagavān iti \
tasmai ha uvāca \
pṛthivī kalā \
antarikṣaṃ kalā \
dyauḥ kalā \
samudraḥ kalā \
eṣa vai somya catuṣkalaḥ pādo brahmaṇo 'nantavān nāma \\406.3\

3. ‘Let me tell you, my dear, a quarter of Brahma.’ ‘Tell me, Sir.’ To him it then said: ‘One sixteenth is the earth. One sixteenth is the atmosphere. One sixteenth is the sky. One sixteenth is the ocean. This, verily, my dear, is the quarter of Brahma, consisting of four sixteenths, named the Endless.