Skandapurana 1.4.43.131

1.4.43.131

madhyaiśca madhyatāṃ yāti śreṣṭhatāṃ yāti cottamaiḥ..
iti dharmaṃ smarannāhaṃ saṃgamārthī punastava..
yannindasi dvijāneva yairapeyo'rṇavaḥ kṛtaḥ.. 45.131 ..

With middling people it reaches mediocrity, and with the highest it reaches excellence.' / Remembering this righteousness, I do not wish to associate with you again, / since you revile the very brahmins by whom the ocean was rendered undrinkable.