Bhagavatapurana 4.29.77

4.29.77

adṛṣṭaṃ dṛṣṭavan naṅkṣed bhūtaṃ svapnavad anyathā /
bhūtaṃ bhavad bhaviṣyac ca suptaṃ sarva-raho-rahaḥ //
yāvad anyaṃ na vindeta vyavadhānena karmaṇām /
mana eva manuṣyendra bhūtānāṃ bhava-bhāvanam //

77. So long as the creature does not pass on to another body on the exhaustion of Karma (the cause of the previous body, *i.e.*, the body in which the Jīva abides at the given time), it is the mind, Oh Lord of men, that is the stay of the mundane life of creatures.