SB 4.1.62
vaitanike karmani yan-
namabhir brahma-vadibhih
agneyya istayo yajñe
nirupyante ’gnayas tu te
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
These forty-nine fire-gods are the beneficiaries of the oblations offered in the Vedic sacrificial fire by impersonalist brahmanas.
Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Impersonalists who perform Vedic fruitive sacrifices are attracted to the various fire-gods and offer oblations in their name. The forty-nine fire-gods are described herewith.