Sūta Gosvāmī said: O brāhmaṇa, first the subtle vibration of transcendental sound appeared from the sky of the heart of the most elevated Lord Brahmā, whose mind was perfectly fixed in spiritual realization. One can perceive this subtle vibration when one stops all external hearing.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
सूत उवाच । समाहितात्मनो ब्रह्मन् ब्रह्मणः परमेष्ठिनः । हृद्याकाशादभून्नादो वृत्तिरोधाद्विभाव्यते
sūta uvāca | samāhitātmano brahman brahmaṇaḥ parameṣṭhinaḥ | hṛdyākāśādabhūnnādo vṛttirodhādvibhāvyate
SB 12.6.37