Svaha

Arjun Asked

114-115. Why did Svaha assume the forms of those six (ladies), O great sage? They are all devoted to their husbands. They are chaste ascetic women (refulgent) like fire; Svaha was guilty. Was she not afraid of those six (ladies) ? For, O sage, they are competent to burn the entire universe through their devotion to their husbands. 

Narada replied : 

116-120. This is true, O most excellent one among the descendants of Kuru. Listen to that reason also why they did not curse her (though) their forms had been assumed by her. Due to their ignorance, those six wives took their baths in Ganga at the place where formerly the semen virile of Rudra had been cast off by Fire-god. 

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Therefore, they got excited with passion and they were deluded by that brilliance (of semen virile). Bashlul (to come in the presence) of their husbands, they remained secret on the banks of Ganga. On observing this opportunity, Svaha wanted to fulfil desire. She entered their bodies and took away their refulgence (semen virile). The wife of Vahni sported with him as has already been mentioned by me. 

121. It was because they remembered this service, O descendant of Bharata, that she was not cursed by them. For curse should not be given to a person who has helped. 

Source

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