Śrī Caitanya Caritamrta · Text Ādi 3.50
ব্যক্ত করি’ ভাগবতে কহে বার বার ।
কলিযুগে ধর্ম—নামসংকীর্তন সার ॥ ৫০ ॥
vyakta kari’ bhāgavate kahe bāra bāra
kali-yuge dharma — nāma-saṅkīrtana sāra
In Śrīmad-Bhāgavatam it is repeatedly and clearly said that the essence of religion in the Age of Kali is the chanting of the holy name of Kṛṣṇa.
Read this verse on Vedabase.ioThis verse has no purport; its meaning is explained by the verses around it.