Agni, the witness
Fire has been at the heart of Vedic worship for as long as the tradition has existed. In a havan — the fire ceremony that forms part of many Hindu rites — offerings of ghee, grains and herbs are placed into a consecrated flame while mantras are recited. The fire is understood as Agni, the divine presence that receives the offering and carries it onward. At a wedding, that role becomes personal: Agni is the witness before whom two people and two families make their commitment.
This is why so much of the ceremony happens around the fire. The vows are spoken beside it, the couple circle it in the pheras, the seven steps are taken in its presence, and in many traditions the bride’s brother helps her offer puffed rice into it. Remove the fire and you remove the centre of the rite — which is why families go to some lengths to find a venue that can accommodate it.
How the fire is used varies. Some traditions include a longer havan with many offerings; others keep it brief. The number of circuits, four or seven, depends on family and community custom. None of these variations changes what the fire is for.