One verse

Srimad Bhagavatam 10.32.19

10.32.19

भजतोऽपि न वै केचिद् भजन्त्यभजत: कुत: । आत्मारामा ह्याप्तकामा अकृतज्ञा गुरुद्रुह: ॥ १९ ॥

bhajato ’pi na vai kecid bhajanty abhajataḥ kutaḥ ātmārāmā hy āpta-kāmā akṛta-jñā guru-druhaḥ

bhajataḥ
with those who are acting favorably
api
even
na
not
vai
certainly
kecit
some
bhajanti
reciprocate
abhajataḥ
with those who are not acting favorably
kutaḥ
what to speak of
ātma-ārāmāḥ
the self-satisfied
hi
indeed
āpta-kāmāḥ
those who have already attained their material desires
akṛta-jñāḥ
those who are ungrateful
guru-druhaḥ
those who are inimical to superiors

Then there are those individuals who are spiritually self-satisfied, materially fulfilled or by nature ungrateful or simply envious of superiors. Such persons will not love even those who love them, what to speak of those who are inimical.