One verse

Srimad Bhagavatam 10.6.3

10.6.3

न यत्र श्रवणादीनि रक्षोघ्नानि स्वकर्मसु । कुर्वन्ति सात्वतां भर्तुर्यातुधान्यश्च तत्र हि ॥ ३ ॥

na yatra śravaṇādīni rakṣo-ghnāni sva-karmasu kurvanti sātvatāṁ bhartur yātudhānyaś ca tatra hi

na
not
yatra
wherever
śravaṇa-ādīni
the activities of bhakti-yoga, beginning with hearing and chanting
rakṣaḥ-ghnāni
the sound vibration to kill all danger and bad elements
sva-karmasu
if one is engaged in his own occupational duty
kurvanti
such things are done
sātvatām bhartuḥ
of the protector of the devotees
yātudhānyaḥ
disturbing elements, bad elements
ca
also
tatra hi
there must be

My dear King, wherever people in any position perform their occupational duties of devotional service by chanting and hearing [śravaṇaṁ kīrtanaṁ viṣṇoḥ], there cannot be any danger from bad elements. Therefore there was no need for anxiety about Gokula while the Supreme Personality of Godhead was personally present.