In the Age of Kali, the sankirtana-yajna (the chanting of the names of God) is recommended by the Vedic scriptures, and this transcendental system was introduced by Lord Chaitanya for the deliverance of all men in this age.
Lord Krishna in His devotional form (as Lord Chaitanya) is mentioned in the Srimad-Bhagavatam (11.5.32) as follows, with special reference to the sankirtana-yajna:
Krishna-varnam tvisha Krishnam
yajanti hi su-medhasaha
"In the age of Kali, intelligent persons perform congregational chanting to worship the incarnation of Godhead who constantly sings the names of Krishna. Although His complexion is not blackish, He is Krishna Himself. He is accompanied by His associates, servants, weapons and confidential companions."
Lord Chaitanya taught Krishna consciousness and chanted the name of Krishna. Therefore, to worship Lord Chaitanya, everyone should together chant the maha-mantra—Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare.
——-(Reference Bhagavad-gita, Chapter 3, Purport of Text 10)