Lamentations is the twenty-fifth book of the Old Testament and the Bible. It is a poetic book of the Hebrew Bible composed by the Jewish Prophet Jeremiah. It mourns the destruction of Jerusalem and the Holy Temple in the 6th century BC.
The first four chapters are acrostics, like some of the Psalms (25, 34, 37, 119), each verse begins with a letter of the Hebrew alphabet taken in order. The first, second, and fourth have each twenty-two verses, the number of the letters in the Hebrew alphabet. The third has sixty-six verses, in which each three successive verses begin with the same letter. The fifth is not acrostic, but also has twenty-two verses. In the second, third and fourth chapters, the order of the 16th letter (ע) and the 17th (פ) is reversed.