Patanjali Yoga Sutra 3.43

Sanskrit Sutra

कायाकाशयोः सम्बन्धसंयमाल्लघुतूलसमापत्तेश्चाकाशगमनम्॥४३॥

Swami Vivekananda's translation

By making Samyama on the relation between the Akasha and the body and becoming light as cotton-wool etc., through meditation on them, the Yogi goes through the skies.

Chapter link: Yoga Sutra Chapter 3