Before the latest creation of
the present universe, the four Vedas (the holy books delivered from
the mouth of the Supreme-God) remained drowned in the waters. It was
necessary to get hold of them to instruct Brahma about the work of
creation. Vishnu was therefore appointed to bring up the Vedas from
the deep. He took the form of a fish, descended into the waters and
brought up these sacred books. Through this avatar, he saved
humanity and the sacred Veda text from the flood.