One verse

Srimad Bhagavatam 4.23.10

4.23.10

भगवद्धर्मिण: साधो: श्रद्धया यतत: सदा । भक्तिर्भगवति ब्रह्मण्यनन्यविषयाभवत् ॥ १० ॥

bhagavad-dharminah sadhoh sraddhaya yatatah sada bhaktir bhagavati brahmany ananya-visayabhavat

bhagavat-dharminah
one who executes devotional service
sadhoh
of the devotee
sraddhaya
with faith
yatatah
endeavoring
sada
always
bhaktih
devotion
bhagavati
unto the Personality of Godhead
brahmani
the origin of impersonal Brahman
ananya-visaya
firmly fixed without deviation
abhavat
became.

Maharaja Prthu thus engaged completely in devotional service, executing the rules and regulations strictly according to principles, twenty-four hours daily. Thus his love and devotion unto the Supreme Personality of Godhead, Krsna, developed and became unflinching and fixed.