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CC Antya 20.9

saṅkīrtana-yajñe kalau kṛṣṇa-ārādhana
sei ta’ sumedhā pāya kṛṣṇera caraṇa
Synonyms: 
saṅkīrtana-yajñe — performing the yajña of chanting the Hare Kṛṣṇa mantra; kalau — in this Age of Kali; kṛṣṇa-ārādhana — the process of worshiping Kṛṣṇa; sei ta’ — such persons; su-medhā — greatly intelligent; pāya — get; kṛṣṇera caraṇa — shelter at the lotus feet of Kṛṣṇa.
Translation: 
“In this Age of Kali, the process of worshiping Kṛṣṇa is to perform sacrifice by chanting the holy name of the Lord. One who does so is certainly very intelligent, and he attains shelter at the lotus feet of Kṛṣṇa.
Purport: 

For further information, one may refer to Ādi-līlā, chapter three, texts 77-78