One verse

Srimad Bhagavatam 1.2.16

1.2.16

शुश्रूषो: श्रद्दधानस्य वासुदेवकथारुचि: । स्यान्महत्सेवया विप्रा: पुण्यतीर्थनिषेवणात् ॥ १६ ॥

susrusoh sraddadhanasya vasudeva-katha-rucih syan mahat-sevaya viprah punya-tirtha-nisevanat

susrusoh
one who is engaged in hearing
sraddadhanasya
with care and attention
vasudeva
in respect to Vasudeva
katha
the message
rucih
affinity
syat
is made possible
mahat-sevaya
by service rendered to pure devotees
viprah
O twice-born
punya-tirtha
those who are cleansed of all vice
nisevanat
by service.

O twice-born sages, by serving those devotees who are completely freed from all vice, great service is done. By such service, one gains affinity for hearing the messages of Vasudeva.