Bhagavatapurana 12.6.37

12.6.37

/0 sūta uvāca
samāhitātmano brahman brahmaṇaḥ parameṣṭhinaḥ /
hṛdy ākāśād abhūn nādo vṛtti-rodhād vibhāvyate //

37. Suta said:— O sage, a certain sound rose from the space in the heart of Brahman, the Highest, when he was in a mood of contemplation. The same sound is even now perceived when the sense of hearing is shut (when the ears are closed by the hand).