Swaha Devi is one among the 37 Goddesses that appeared from the 7 Amsha Avatars of Mother Goddess Shakti. She is the wife of Agni, Fire God in Hindu religion. It is said that while offering Havis into Homa Agni, Swaha Devi should be invoked. If she is not involved Devas will not accept the offerings.
According to the Brahmavidya Upanishad, Swaha Devi represents the power that cannot be burned by Agni.
It is said in the Puranas and Upanishads that Swaha Devi was enamored by Agni and wished to dwell with him. This is how She became the consort of Agni.
Swaha dwells in Agni this is the reason why she should be invoked while pouring or making offerings into fire in Hindu rituals.
In some versions, she is the mother of Kartik (Skanda or Muruga). She is also the mother of Agneya — the daughter of Agni.
As per some scriptures, Her body is said to consist of the four Vedas and her six limbs are the six Angas of the Vedas.
Story Of Agni And Swaha Devi in Mahabharata
In the Mahabharata Vana Parva, Sage Markandeya narrates the story of Swaha Devi to the Pandavas. She was the daughter of Daksha Prajapati and his wife Prasuti. She fell in love with Agni. She pursued Agni without him noticing her.
Once, Agni presided over the yagna of the Saptarishis. Agni was infatuated by the wives of the Saptarishis who were so attractive and beautiful. He kept staring at them.
But soon Agni could not bear the guilt of longing for wives belonging to someone else and he went to the forests to perform penance.
Swaha Devi followed him. She took the forms of the wives of the Saptarishis (except for Arundhati, wife of Vashishtha) and approached Agni. Agni and Swaha spent making love in various forms.