The order of the Psalms is not chronological; e.g., chap. iii. refers to the rebellion of Absalom, whilst chap, cxlii. was composed before the death of Saul. The principle which guided the collector in fixing the place of each psalm is not known. But it is certainly not the result of mere chance that the first two psalms speak of the Law of God, and of the punishment of those who rebel against God and against His anointed; and that the last psalm calls upon all to praise God with all their soul: “Let every thing that hath breath praise the Lord, Hallelujah!” Nor is it mere chance that the psalms are divided, like the Law, into five groups or books, each one ending with a doxology. It is possible that the psalms were recited or sung at the public service in a manner corresponding to the reading of the Law and the Prophets. The first two books contain most of the psalms superscribed ‏לדוד‎ “by David,” but there are also some in the other books (one in III., two in IV., fourteen in V.). At the end of the second book (lxxii. 20) the following words are added: “The prayers of David, the son of Jesse, are ended;” i.e., the hope which has just been expressed in the words ‏וימלא כבוד יי את כל הארץ‎ “And the whole earth shall be filled with the glory of God,” forms the aim and end of all the prayers of David, the son of Jesse. The verse does not mean that the first seventy-two chapters of the Psalms contain all the prayers of David, as there are several psalms of David between chaps, lxxiii. and cl. The Psalms were composed by David and other authors partly for private use, partly for the public service in the Temple and other places of worship. Of those that were originally for private use some were subsequently adapted for public service, and even those intended from the beginning for public worship were adapted to the different modes of recitation or singing. The Book of Psalms includes, therefore, two recensions of several chapters; e.g., xiv. and liii.; xviii. and 2 Sam. xxii.; lx. 7–14 and cviii. 7–14; lvii. 8–12 and cviii. 2–6; cv. 1–15 and 1 Chron. xvi. 8–22; xcvi. and 1 Chron. xvi. 23–33; cxxxv. and cxxxvi. A considerable portion of our daily prayers consists of psalms. We distinguish the following groups:—(a.) ‏פסוקי דזמרא‎ “Verses of song,” Ps. cxlv. to cl.; to which the following are added on Sabbaths and Festivals: xix., xxxiv., xc, xci., cxxxv., cxxxvi. (called ‏הלל הגדול‎ “the great Hallel”), xxxiii., xcii., and xciii. (b.) ‏שיר של יום‎ “Song of the day;” a different psalm is recited each day of the week after the morning prayer in the following order: xxiv., xlviii., lxxxii., xciv., lxxxi., xciii., xcii. (c.) ‏קבלת שבת‎ “Friday evening psalms,” xcv. to xcix. (d.) Sabbath afternoon psalms: civ., cxx. to cxxxiv. (e.) ‏הלל‎ “Praise,” cxiii. to cxviii. (f.) Penitential psalms after evening prayer on week-days, in the following order: xxv., xxxii., xxxviii., li., lxxxvi.