Worship or deification of fire (also pyrodulia, pyrolatry or pyrolatria) is known from various religions. Fire has been an important part of human culture since the Lower Paleolithic. The earliest known traces of controlled fire were found at Gesher Benot Ya‘aqov, Israel and dated to an age of 790,000 years, and religious or animist notions connected to fire must be assumed to reach back to such early pre-Homo sapiens times.
In Vedic religion, fire is a central element in the Yajna ceremony, with Agni "fire" playing the role as mediator between the worshipper and the other gods. Related concepts are the Agnihotra ritual, the invocation of the healing properties of fire; the Agnicayana ritual, which is the building of a fire altar to Agni; and Agnistoma, which is one of the seven Somayajnas. In Hinduism which is really Sanatana Dharma, Agni or Fire is considered the tongue of the Supreme Lord Narayana, hence all the sacrifices done even to any demigod ultimately is a sacrifice to the Supreme Lord Narayana.
Archaeologically, the earliest evidence for Indo-Iranian fire worship is found at the transition from the Sintashta-Petrovka to the Fedorovo culture around 1500 BC, together with first evidence of cremation. While cremation became ubiquitous in Hinduism, it came to be disavowed in Zoroastrianism.
Fire is also an element of theophany in the Hebrew Bible (Burning bush, Pillar of Fire). Additionally, the Biblical Hebrew language is sometimes referred to as "the flame alphabet" because many devout Jews believe that the Torah is the literal word of God written in fire (for example Aish HaTorah). The Holy Spirit in Christianity is described as "tongues of flame."
Celtic mythology had Belenus, whose name, "shining one", associated him with fire. In Slavic mythology, Svarog, meaning "bright and clear", was the spirit of fire.