Old Testament both Jews and Christians have always interpreted the Bible (both the "Old" and "New" Testaments) as an affirmation of the oneness of Almighty God. The Old Testament stresses the special relationship between God and his chosen people, Israel, but includes instructions for proselytes as well. This relationship is expressed in the biblical covenant (contract) between the two, received by Moses. The law codes in books such as Exodus and especially Deuteronomy are the terms of the contract: Israel swears faithfulness to God, and God swears to be Israel's special protector and supporter. Further themes in the Old Testament include salvation,
Book of Leviticus sin and guilt offerings, provide the means to gain forgiveness for sins (Leviticus 4–5) and purification from impurities (Leviticus 11–16) so that God can continue to live in the Tabernacle in the midst of the people. Scholars generally agree that Leviticus developed over a long time and that it reached its present form in the Persian period (538–332 BC). The English name Leviticus comes from the Latin "Leviticus," which is in turn from the Greek Greek Λευιτικόν, "Leuitikon", referring the priestly tribe of the Israelites, “Levi.” The Greek expression is in turn a variant of the rabbinic Hebrew "torat kohanim",