One verse

Srimad Bhagavatam 10.26.21

10.26.21

य एतस्मिन् महाभागे प्रीतिं कुर्वन्ति मानवा: । नारयोऽभिभवन्त्येतान् विष्णुपक्षानिवासुरा: ॥ २१ ॥

ya etasmin mahā-bhāge prītiṁ kurvanti mānavāḥ nārayo ’bhibhavanty etān viṣṇu-pakṣān ivāsurāḥ

ye
those persons who
etasmin
unto this child
mahā-bhāge
most auspicious
prītim
affection
kurvanti
execute
mānavāḥ
such persons
na
not
arayaḥ
their enemies
abhibhavanti
do overcome
etān
those who are attached to Kṛṣṇa
viṣṇu-pakṣān
the demigods, who always have Lord Viṣṇu on their side
iva
like
asurāḥ
the demons

Demons cannot harm the demigods, who always have Lord Viṣṇu on their side. Similarly, any person or group attached to all-auspicious Kṛṣṇa cannot be defeated by enemies.