Srimad-Bhagavatam: Canto 4 - Chapter 1 - Verse 62

Sanskrit:

वैतानिके कर्मणि यन्नामभिर्ब्रह्मवादिभि: ।आग्नेय्य इष्टयो यज्ञे निरूप्यन्तेऽग्नयस्तु ते ॥ ६२ ॥

ITRANS:

vaitānike karmaṇi yan-nāmabhir brahma-vādibhiḥāgneyya iṣṭayo yajñenirūpyante ’gnayas tu te

Translation:

These forty-nine fire-gods are the beneficiaries of the oblations offered in the Vedic sacrificial fire by impersonalist brāhmaṇas.

Purport:

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.