Bhagavatapurana 3.29.26

3.29.26

ātmanaś ca parasyāpi yaḥ karoty antarodaram /
tasya bhinna-dṛśo mṛtyur vidadhe bhayam ulbaṇam //

26. If a person makes out the least difference between himself and another (himself and Paramatman) I, who am Death, cause great fear to him who is full of notions of difference (I throw him into the terrible Samsara as long as he continues to have the notion of difference.)