The Pentateuch or Torah (the Greek and Hebrew terms, respectively, for the Bible's books of Genesis, Exodus, Leviticus, Numbers and Deuteronomy) describe the prehistory of the Israelites from the creation of the world, through the earliest biblical patriarchs and their wanderings, to the Exodus from Egypt and the encounter with God in the wilderness. The books contain many inconsistencies, repetitions, different narrative styles, and different names for God. John Van Seters notes that "Turning to the Tetrateuch, we observe a feature that I have highlighted by the use of italics, in which parallel blocks of material have been set side by side. Thus, there are two accounts of creation, two genealogies of Seth, two genealogies of Shem, two covenants between Abraham and his god, two revelations to Jacob at Bethel, two calls of Moses to rescue his people, two sets of laws given at Sinai, two Tents of Meeting/Tabernacles set up at Sinai." The repetitions, styles and names are not random, but follow identifiable patterns, and the study of these patterns led scholars to the conclusion that four separate sources lie behind them.