Srimad Bhagavatam Canto 04, Chapter 07, Text 41

SB 4.7.41

agnir uvaca
yat-tejasaham susamiddha-teja
havyam vahe svadhvara ajya-siktam
tam yajniyam panca-vidham ca pancabhih
svistam yajurbhih pranato ’smi yajnam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
The fire-god said: My dear Lord, I offer my respectful obeisances unto You because by Your favor I am as luminous as blazing fire and I accept the offerings mixed with butter and offered in sacrifice. The five kinds of offerings according to the Yajur Veda are all Your different energies, and You are worshiped by five kinds of Vedic hymns. Sacrifice means You, the Supreme Personality of Godhead.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada: 
In Bhagavad-gita it is clearly said that yajna should be performed for Lord Visnu. Lord Visnu has one thousand popular transcendental names, out of which one name is Yajna. It is clearly said that everything should be done for the satisfaction of Yajna, or Visnu; all other actions a person may take are only causes for his bondage. Everyone has to perform yajna according to the Vedic hymns. As stated in the Upanisads, fire, the altar, the auspicious full moon, the period of four months called caturmasya, the sacrificial animal, and the beverage called soma are necessary requisites, as are the specific hymns mentioned in the Vedas and composed of four letters. One hymn is as follows: asravayeti catur-aksaram astu srausad iti catur-aksaram yajeti dvabhyam ye yajamahah. These mantras, chanted according to the sruti and smrti literatures, are only to please Lord Visnu. For the deliverance of those who are materially conditioned and attached to material enjoyment, performing yajna and following the rules and regulations of the four divisions of society and of spiritual life are recommended. It is said in the Visnu Purana that by offering sacrifice to Visnu one can gradually be liberated. The whole target of life, therefore, is to please Lord Visnu. That is yajna. Any person who is in Krsna consciousness has dedicated his life for the satisfaction of Krsna, the origin of all Visnu forms, and by offering worship and prasada daily, he becomes the best performer of yajna. In the Srimad-Bhagavatam it is clearly stated that in this Age of Kali the only successful performance of yajna, or sacrifice, is yajnaih sankirtana-prayaih: the best type of sacrifice is simply to chant Hare Krsna, Hare Krsna, Krsna Krsna, Hare Hare/ Hare Rama, Hare Rama, Rama Rama, Hare Hare. This yajna is offered before the form of Lord Caitanya, as other yajnas are offered before the form of Lord Visnu. These recommendations are found in the Eleventh Canto of the Srimad-Bhagavatam. Moreover, this yajna performance confirms that Lord Caitanya Mahaprabhu is Visnu Himself. As Lord Visnu appeared at the Daksa yajna long, long ago, Lord Caitanya has appeared in this age to accept our sankirtana-yajna.
Srimad Bhagavatam Canto 04, Chapter 07, Text 40
Srimad Bhagavatam Canto 04, Chapter 07, Text 42