Orthodox Judaism is a collective term for the traditionalist branches of contemporary Judaism. Theologically, it is chiefly defined by regarding the Torah, both Written and Oral, as literally revealed by God on Mount Sinai and faithfully transmitted ever since. Orthodox Judaism therefore advocates a strict observance of Jewish Law, or Halakha, which is to be interpreted and determined only according to traditional methods and in adherence to the continuum of received precedent through the ages. It regards the entire halakhic system as ultimately grounded in immutable revelation, essentially beyond external and historical influence. More than any theoretical issue, obeying the dietary, purity, ethical, and other laws of Halakha is the hallmark of Orthodoxy. Other key doctrines include belief in a future resurrection of the dead, divine reward and punishment for the righteous and the sinners, the Election of Israel, and an eventual restoration of the Temple in Jerusalem under the Messiah.