The Bible comprises 24 books for Jews, 66 for Protestants, 73 for Catholics, and 78 for most Orthodox Christians. These books vary in length from a single page of modern type to dozens of pages. All but the shortest are divided into chapters, generally a page or two in length.

Each is further divided into verses of a few short lines or sentences. Pasuk (plural pesukim) is the Hebrew term for verse.

The Jewish divisions of the Hebrew text differ at various points from those used by Christians. For instance, in Jewish tradition, the ascriptions to many Psalms are regarded as independent verses, making 116 more verses, whereas the established Christian practice is to count and number each Psalm ascription together with the first verse following it. Some chapter divisions also occur in different places, e.g. in Hebrew Bibles is numbered as in Christian translations.

Chapters

The original manuscripts did not contain the chapter and verse divisions in the numbered form familiar to modern readers. Some portions of the original texts were logically divided into parts following the Hebrew alphabet; for instance, the earliest known copies of the book of Isaiah use Hebrew letters for paragraph divisions. (This was different from the acrostic structure of certain texts following the Hebrew alphabet, such as Psalm 119 and the book of Lamentations.) There are other divisions from various sources which are different from what we use today.

The Old Testament began to be put into sections before the Babylonian Captivity (586 BC) with the five books of Moses being put into a 154-section reading program to be used in a three-year cycle. Later (before 536 BC) the Law was put into 54 sections and 669 sub-divisions for reading.

By the time of the Council of Nicaea in AD 325, the New Testament had been divided into paragraphs, although the divisions were different from the modern Bible.

An important canon of the New Testament was proclaimed by Pope Damasus I in the Roman synod of 374. Pope Damasus also induced Jerome, a priest from Antioch, to undertake his famous translation of the entire Bible, both Old and New Testaments, from Hebrew and Greek into Latin, the official language of the time. This translation is known as the Vulgate. The Church continued to finance the very expensive process of copying and providing copies of the Bible to local churches and communities from that point up to and beyond the invention of the printing press, which greatly reduced the cost of producing copies of the Scriptures.

Churchmen Archbishop Stephen Langton and Cardinal Hugo de Sancto Caro determined different schemas for systematic division of the Bible between 1227 and 1248. It is the system of Archbishop Langton on which the modern chapter divisions are based.

Verses

It is presently unknown how early the Hebrew verse divisions were incorporated into the books that comprise the Biblical canon. However, it is beyond dispute that for at least a thousand years the Tanakh has contained an extensive system of multiple levels of section, paragraph, and phrasal divisions that were indicated in Masoretic vocalization and cantillation markings. One of the most frequent of these was a special type of punctuation, the sof passuq, symbol for a full stop or sentence break, resembling the colon mark (:) of English and Latin orthography. With the advent of the printing press and the translation of the Bible into English, Old Testament versifications were made that correspond predominantly with the existing Hebrew full stops, with a few isolated exceptions. A product of meticulous labour and unwearying attention, the Old Testament verse divisions stand today in essentially the same places as they have been passed down since antiquity. Most attribute these to Rabbi Isaac Nathan around 1440.Moore, G.F. The Vulgate Chapters and Numbered Verses in the Hebrew Bible at JSTOR.