Why did Perseuss father send him away greek myth?

In Greek mythology, Perseus's father, King Acrisius of Argos, sent him away to protect himself from a prophecy that foretold his death at the hands of his grandson. When Acrisius learned that his daughter, Danaë, would bear a son who would fulfill this prophecy, he imprisoned her in a bronze chamber to prevent any chance of conception. However, Zeus visited Danaë in the form of golden rain, leading to the birth of Perseus. To eliminate the threat, Acrisius cast both mother and child into the sea in a wooden chest.