The documents J, E and P, which, for convenience, we have treated as if each were the product of a single pen, represent in reality movements which extended over decades and even centuries. The Jehovist, e.g., who traces the descent of shepherds, musicians, and workers in metal to antediluvian times (Gen. iv. 19-22), cannot be the Jehovist who told the story of the Flood, which interrupted the continuity of human life. These distinctions are known to criticism as Jl, J2, etc.; but, though they stand for undoubted literary facts, it is altogether futile to attempt, on this basis, an analysis of the entire document into its component parts. The presence of several hands may also be detected, though not so readily, in E. Most scholars suppose J to precede E, but one or two reverse the order. The truth is that there are passages in J inspired by splendid prophetic conceptions, which must be later than the earliest edition of E; and the moment it is recognized that a long period elapsed before either document reached its present form, the question of priority becomes relatively unimportant. P is even more obviously the result of a long process marked by repeated additions and refinements. Numbers xviii. 7, e.g., implies that ordinary priests might pass within the vail, whereas in Leviticus xvi. this is possible only to the high priest, and even to him only once a year. Exodus xxix. 7 represents only the high priest as anointed, Exodus xxviii. 41 the other priests as well. The section in Exodus xxx. 1-10 on the altar of incense must be later than the list in xxvi. 31-37, where it is not mentioned. The age, too, at which the Levites might enter upon their service appears to have been repeatedly changed; in Numbers iv. 3 it is put at thirty years, in viii. 24 at twenty-five (and i Chron. xxiii. 24 at twenty). All this only shows the unceasing attention that was paid by the priests to the problem of worship; and the length of the period over which this attention was spread may be inferred from the fact that, even in the third century B.C., as we know from the Septuagint, the Hebrew text of Exodus xxxv.-xl. was not absolutely fixed.