According to scholars including Neil Forsyth and John L. McKenzie, the Old Testament incorporates stories, or fragments of stories, from extra-biblical mythology. According to the New American Bible, a Catholic Bible translation produced by the Confraternity of Christian Doctrine, the story of the Nephilim in Genesis 6:1-4 "is apparently a fragment of an old legend that had borrowed much from ancient mythology", and the "sons of God" mentioned in that passage are "celestial beings of mythology". The New American Bible also says that Psalm 93 alludes to "an ancient myth" in which God battles a personified Sea. Some scholars have identified the biblical creature Leviathan as a monster from Canaanite mythology. According to Howard Schwartz, "the myth of the fall of Lucifer" existed in fragmentary form in Isaiah 14:12 and other ancient Jewish literature; Schwartz claims that the myth originated from "the ancient Canaanite myth of Athtar, who attempted to rule the throne of Ba'al, but was forced to descend and rule the underworld instead".