Bhagavatapurana 3.5.12

3.5.12

munir vivakṣur bhagavad-guṇānāṃ sakhāpi te bhāratam āha kṛṣṇaḥ /
yasmin nṛṇāṃ grāmya-sukhānuvādair matir gṛhītā nu hareḥ kathāyām //

12. Also your friend the sage Krishna (Vyasa) has taught (produced) the Mahabharata only for the purpose of describing the excellent attributes of the (glorious) and supreme Lord, for, (even) there, the mind of men is certainly (taken up with) the story (accounts) of Hari, through the repeated descriptions of lower pleasures (objects).