In the age of Kali, the greatest common formula of sacrifice is the sankirtana−yajna: [King Pariksit to the personality of Kali]: Therefore, O friend of irreligion, you do not deserve to remain in a place where experts perform sacrifices according to truth and religious principles for the satisfaction of the Supreme Personality of Godhead.
Yajnesvara, or the Supreme Personality of Godhead, is the beneficiary of all kinds of sacrificial ceremonies. Such sacrificial ceremonies are prescribed differently in the
scriptures for different ages. In other words, sacrifice means to accept the supremacy of the Lord and thereby perform acts by which the Lord may be satisfied in all respects... In this age of Kali, the greatest common formula of sacrifice is the sankirtana−yajna. That is the opinion of the experts who know how to propagate the process of yajna. Lord Caitanya preached this method of yajna, and it is understood from this verse that the sacrificial method of sankirtana−yajna may be performed anywhere and everywhere in order to drive away the personality of Kali and save human society from falling prey to the influence of the age.
¯Srimad−Bhagavatam 1.17.33
In the age of Kali, the only fruitful sacrifice is the sacrifice of the congregational chanting of the holy names of the Lord: The sacrificial fire kindled by the sages of Naimisaranya was certainly full of smoke and doubts because of so many flaws. The first flaw is that there is an acute scarcity of expert brahmanas able to carry out such performances successfully in this age of Kali. Any discrepancy in such sacrifices spoils the whole show, and the result is uncertain, like agricultural enterprises. The good result of tilling the paddy field depends on providential rain, and therefore the result is uncertain. Similarly, performance of any kind of sacrifice in this age of Kali is also uncertain. Unscrupulous greedy brahmanas of the age of Kali induce the innocent public to such uncertain sacrificial shows without disclosing the scriptural injunction that in the age of Kali there is no fruitful sacrificial performance but the sacrifice of the congregational chanting of the holy name of the Lord.
¯Srimad−Bhagavatam 1.18.12