Brahma Sutras – According to Shankara 2-3-2
Topic 2 - Air springs from ether
Sutra 2,3.8
एतेन मातरिश्वा व्याख्यातः ॥ ८ ॥
etena mātariśvā vyākhyātaḥ || 8 ||
etena—By this; mātariśvā—air; vyākhyātaḥ—is explained.
8. By this (i.e. the foregoing explanation about Ākāśa) (the fact of) air (also being an effect) is explained.