Brihadaranyaka Upanishad 6.1.8

6.1.8

vāgghoccakrāma sā saṃvatsaraṃ proṣyāgatyovāca kathamaśakata madṛte jīvitumiti te hocuryathā kalā avadanto vācāprāṇantaḥ prāṇena paśyantaścakṣuṣā śṛṇvantaḥ śrotreṇa vidvām̐so manasā prajāyamānā retasaivamajīviṣmeti praviveśa ha vāk

The organ of speech went out. After staying a whole year out it came back and said, ‘How did you manage to live without me?’ They said, ‘We lived just as dumb people do, without speaking through the organ of speech, but living through the vital force, seeing through the eye, hearing through the ear, knowing through the mind and having children through the organ of generation.’ So the organ of speech entered.