One verse

Srimad Bhagavatam 12.6.37

12.6.37

सूत उवाच समाहितात्मनो ब्रह्मन् ब्रह्मण: परमेष्ठिन: । हृद्याकाशादभून्नादो वृत्तिरोधाद् विभाव्यते ॥ ३७ ॥

sūta uvāca samāhitātmano brahman brahmaṇaḥ parameṣṭhinaḥ hṛdy ākāśād abhūn nādo vṛtti-rodhād vibhāvyate

sūtaḥ uvāca
Sūta Gosvāmī said
samāhita-ātmanaḥ
whose mind was perfectly fixed
brahman
O brāhmaṇa (Śaunaka)
brahmaṇaḥ
of Lord Brahmā
parame-sthinaḥ
the most elevated of living beings
hṛdi
within the heart
ākāśāt
from out of the sky
abhūt
arose
nādaḥ
the transcendental subtle sound
vṛtti-rodhāt
by stopping the functioning (of the ears)
vibhāvyate
is perceived

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.