Bhagavatapurana 10.4.26

10.4.26

evam etan mahā-bhāga yathā vadasi dehinām /
ajñāna-prabhavāhaṃ-dhīḥ sva-pareti bhidā yataḥ //

26. O blessed one (O most wicked one), it is even so as you say; Ahankara on the part of creatures has its origin in ignorance

and it is the cause of the notion of difference as “Mine” and as “Another’s”.