Srimad Bhagavatam

References to text SB 12.3.52
SB 12.3.52: Whatever result was obtained in Satya-yuga by meditating on Viṣṇu, in Tretā-yuga by performing sacrifices, and in Dvāpara-yuga by serving the Lord’s lotus feet can be obtained in Kali-yuga simply by chanting the Hare Kṛṣṇa mahā-mantra.

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Chapter 8: The Avataras
Teachings of Lord Caitanya
TLC 8