Yoga Sūtra Chapter Three verse 42
कायाकाशयोः संबन्धसंयमात् लघुतूलसमापत्तेश्चाकाश गमनम् ॥४२॥
kāya-ākāśayoḥ saṃbandha-saṃyamāt-laghu-tūla-samāpatteḥ ca-ākāśa-gamanam ||42||
From complete restraint of relationship of body and space
and unity with lightness and cotton,
travel through space.