Caitanya-caritāmṛta 19.170
sarvopādhi-vinirmuktaṁ tat-paratvena nirmalam hṛṣīkeṇa hṛṣīkeśa- sevanaṁ bhaktir ucyate
[sarvopaadhi-vinirmuktam tat-paratvena nirmalam hrisheekena hrisheekesha- sevanam bhaktir uchyate]
Blended reading (Sanskrit + English inline)
sarvopādhi-vinirmuktaṁ tat-paratvena nirmalam hṛṣīkeṇa hṛṣīkeśa- sevanaṁ bhaktir ucyate
“ ‘Bhakti, or devotional service, means engaging all our senses in the service of the Lord, the Supreme Personality of Godhead, the master of all the senses. When the spirit soul renders service unto the Supreme, there are two side effects. One is freed from all material designations, and one’s senses are purified simply by being employed in the service of the Lord.’
Purport
This verse quoted from the Nārada-pañcarātra is found in the Bhakti-rasāmṛta-sindhu (1.1.12).
— A.C. Bhaktivedanta Swami Prabhupāda
My note
Source: vedabase.io