One of the fourteen sections of the Satapathabrahmana, the tenth, called Agni-rahasya or "the mystery of Agni (the god and altar)," is entirely devoted to this feature of the sacrificial symbolism.
He is servant of Agni the god of light and of Varuna the divine judge.
AGNI, the Hindu God of Fire, second only to Indra in the power and importance attributed to him in Vedic mythology.
The sacrifices made to Agni pass to the gods, for Agni is a messenger from and to the gods; but, at the same time, he is more than a mere messenger, he is an immortal, for another hymn runs: "No god indeed, no mortal is beyond the might of thee, the mighty One...
In pictorial art Agni is always represented as red, two-faced, suggesting his destructive and beneficent qualities, and with three legs and seven arms.