What is the biblical basis for the Catholic and Eastern doctrines of the Assumption of Mary?

Catholic doctrine asserts that Mary the Mother of Jesus was not only without sin and ever-virgin, but that she also ascended into Heaven. Some Eastern traditions hold that she even died, then was raised on the third day. The _Catechism of the Catholic Church_ States, in paragraph 974: >The Most Blessed Virgin Mary, when the course of her earthly life was completed, was taken up body and soul into the glory of heaven, where she already shares in the glory of her Son's Resurrection, anticipating the resurrection of all members of His Body. From Wikipedia: >Eastern Christians believe that Mary died a natural death, that her soul was received by Christ upon death, and that her body was resurrected on the third day after her death and that she was taken up into heaven bodily in anticipation of the general resurrection. Her tomb was found empty on the third day. "...Orthodox tradition is clear and unwavering in regard to the central point [of the Dormition]: the Holy Virgin underwent, as did her Son, a physical death, but her body – like His – was afterwards raised from the dead and she was taken up into heaven, in her body as well as in her soul. She has passed beyond death and judgement, and lives wholly in the Age to Come. What is the biblical basis for this doctrine?