Overview
Agni Sakshi, literally "with fire as witness", refers to the Hindu tradition of solemnising a marriage in the presence of the sacred fire (Agni). The fire is regarded as the divine witness whose presence sanctifies the union of the bride and the groom. The concept is closely associated with the Saptapadi rite, considered the most important ritual of a Hindu wedding ceremony.
Saptapadi (Sanskrit: सप्तपदी), also known as saat phere in several North Indian traditions, literally means "taking seven steps together". In this rite, the bride and the groom tie a ceremonial knot and either take seven steps together or complete seven circumambulations around the sacred fire. Each step or round is accompanied by a vow, traditionally covering aspects such as nourishment, strength, prosperity, happiness, progeny, well-being, and lifelong companionship.
According to custom, the marriage is considered complete only after the seventh step or round has been taken. The presence of Agni as witness is held to give the vows their binding and sacred character, distinguishing the Hindu wedding from a purely social contract. The phrase "Agni Sakshi" is therefore commonly invoked to denote the sanctity and irrevocability of the marital bond formed through this ritual.
While the core rite is shared across Hindu communities, regional and sectarian variations exist in the procedure, the accompanying mantras, and whether the couple takes seven steps in a line or makes seven rounds around the fire. The phrase has also passed into wider cultural usage in India, appearing in literature, cinema, and television as a shorthand for the solemn vows of Hindu matrimony.
References
Adapted from the English Wikipedia article on Saptapadi.