Patanjali Yoga Sutra 3.42

Sanskrit Sutra

श्रोत्राकाशयोः सम्बन्धसंयमाद्दिव्यं श्रोत्रम्॥४२॥

Swami Vivekananda's translation

By making Samyama on the relation between the ear and the Akasha comes divine hearing.

Chapter link: Yoga Sutra Chapter 3