These greater groups rest, however, upon other smaller ones, some formally acknowledged, e.g. the so-called Psalms of Ascent or Pilgrim psalms (cxx.-cxxxiv.), the Psalms of David, Psalms of the Korahites (xlii.-xlix., etc.), Psalms of Asaph (lxxiii.-lxxxiii., etc.), and others not so obvious in a translation, e.g. the Hallelujah Psalms, cxi.-cxiii., cxlvi.-cl. These groups must often have enjoyed an independent reputation as groups, and even been invested with a certain canonical authority, for occasionally the same psalm appears in two different groups (xiv.=liii., xl. 13-17=lxx., cviii.=lvii. 7-11 +lx. 6-12). Such repetition proves that the final editors did not consider themselves at liberty to make any change within the groups. The principle of the arrangement of individual psalms within the group was probably not a scientific one: e.g. xxxiv. and xxxv. seem to be placed together for no other reason than that both refer to "the angel of Jehovah," xxxiv. 7, xxxv. 5. Sometimes a psalm has been wrongly divided into two (cf. xlii., xliii., originally one psalm) and occasionally two psalms have been united, usually for reasons that are transparent (so perhaps xix., the revelation in the heavens and the revelation in the Scriptures, and xxiv., the entrance of Jehovah into His temple, and the essential conditions for the entrance of man). The original order of the groups themselves appears to have been dislocated. Whoever added the subscription to Psalm lxxii. can hardly have been aware of the eighteen psalms which, in the subsequent books of the Psalter, are ascribed to David; nor is it natural to suppose that the Asaphic (l.) and Korahitic psalms (xlii.-xlix.) stood in the second book when that subscription was written. It is not improbable that Psalms xlii.-l. originally belonged to the third book, along with the Asaphic group, lxxiii.-lxxxiii., and that lxxii. 20, "The prayers of David the son of Jesse are ended," was intended as the subscription of all the Davidic psalms that had then been collected (Book I, except Pss. i., ii., x., xxxiii., and book 2, Pss. li.-lxx.).[1] The first two books originally represented a Davidic hymn-book; they probably represent, as a whole, the oldest part of the Psalter. [Footnote 1: Psalms i. and ii. were placed at the beginning as prefatory to the whole Psalter. They deal with the two cardinal points of Judaism--the law and the Messianic hope. Psalms ix. and x. originally constituted _one_ alphabetic psalm, and xxxiii. is ascribed to David in the Septuagint.]