Story of Deepavali

The demon king Narakasura defeated the king of Gods, Lord Indra. He snatched away the magnificent earrings of Aditi, the Mother Goddess and imprisoned sixteen thousand daughters of the gods and saints in his harem.
Lord Krishna killed the demon and liberated the imprisoned damsels and also recovered Aditi's precious earrings. Lord Krishna then smeared his forehead with the demon king's blood, and returned home where womenfolk massaged scented oil into his body and gave him a bath to wash away the filth from his body.
洗浴风俗在日出之前在这天从那以后成为了Diwali天的一个传统部分。


Source: http://www.ezinemarketingcenter.com/blog/archives/002034.html