A chief part of the duty of the priests consisted in offering sacrifice and reciting the services. The sacrifices were of two kinds, as in the Jewish ritual. The same animals and the same fruits of the earth were offered by both Babylonians and Israelites, and in many cases the regulations relating to the sacrifices were similar. The services were elaborate, and the rubrics attached to the hymns and prayers which had to be recited are minute and complicated. The hymns had been formed into a sort of Bible, which had in time acquired a divine authority. So sacred were its words, that a single mispronunciation of them was sufficient to impair the efficacy of the service. Rules for their pronunciation were accordingly laid down, which were the more necessary as the hymns were in Sumerian. The dead language of Sumer had become sacred, like Latin in the Middle Ages, and each line of a hymn was provided with a translation in Semitic Babylonian.

In appearance, a Babylonian temple was not very unlike those of Canaan or of Solomon. The image of the god stood in the innermost shrine, the Holy of Holies, where also was the mercy-seat, whereon it was believed, as upon a throne, the deity was accustomed to descend at certain times of the year. In the little temple of Balawât, near Nineveh, discovered by Mr. Hormuzd Rassam, the mercy-seat was shaped like an ark, and contained two written tables of stone; no statue of the god, however, seems in this instance to have stood beside it. In front of it was the altar, approached by steps.

In the court of the temple was a "sea" or "deep," like that which was made by Solomon. An early hymn which describes the construction of one of them, states that it was of bronze, and that it rested on the figures of twelve bronze oxen. It was intended for the ablutions of the priests and the vessels of the sanctuary, and was a representation of that primæval deep out of which it was believed that the world originated.

One peculiarity the Babylonian temples possessed which was not shared by those of the west. Each had its ziggurat or "tower," which served for the observation of the stars, and in the topmost storey of which was the altar of the god. It corresponded with the "high-place" of Canaan, where man imagined himself nearest to the gods of heaven. But in the flat plain of Babylonia it was needful that the high-place should be of artificial construction, and here accordingly they built the towers whose summits "reached to" the sky.

The temples and their ministers were supported partly by endowments, partly by voluntary gifts, sometimes called kurbanni, the Hebrew korban, partly by obligatory contributions, the most important of which was the esrâ or "tithe." Besides the fixed festivals, which were enumerated in the calendar, special days of thanksgiving or humiliation were appointed from time to time. There was also a weekly Sabattu or "Sabbath," on the 1st, 7th, 14th, 21st, and 28th days of the month, as well as on the 19th, the last day of the seventh week from the beginning of the previous month. The Sabbath is described as "a day of rest for the heart," and all work upon it was forbidden. The king was not allowed to change his dress, to ride in his chariot, or even to take medicine, while the prophet himself was forbidden to utter his prophecies.

The mass of the people looked forward to a dreary existence beyond the grave. The shades of the dead flitted like bats in the darkness of the under-world, hungry and cold, while the ghosts of the heroes of the past sat beside them on their shadowy thrones, and Allat, the mistress of Hades, presided over the warders of its seven gates. The Sumerians had called it "the land whence none return," though in the theology of Eridu and Babylon Asari or Merodach was already a god who, through the wisdom of his father Ea, "restored the dead to life." But as the centuries passed, new and less gloomy ideas grew up in regard to the future life. In a prayer for the Assyrian king the writer asks that he may enjoy an endless existence hereafter in "the land of the silver sky," and the realms of the gods of light had been peopled with the heroes of Babylonian literature at an early date.

The belief in Hades went back to those primitive ages when the Sumerians of Eridu conceived of the earth as floating on the deep, which surrounded it as a snake with its coils, while the sky covered it above like an extinguisher, and was supported on the peak of "the mountain of the world," where the gods had their abode. This primitive cosmological conception underwent changes in the course of time, but the underlying idea of an abyss of waters out of which all things were shaped remained to the end. The Chaldæan Epic of the Creation declares that "in the beginning," "the chaos of the deep" had been the "mother" of both heaven and earth, out of whom first came the primæval deities Lakhmu and Lakhamu, and then An-sar and Ki-sar, the upper and lower firmament. Long ages had to elapse before the Trinity of the later theology—Anu, Ea, and Bel—were born of these, and all things made ready for the genesis of the present world. Merodach, the champion of the gods of light and law, had first to do battle with Tiamat, "the dragon" of "the deep," and her allies of darkness and disorder. He had proved his powers by creating and annihilating by means of his "word" alone, and the conflict which he waged ended in the destruction of the enemy. The body of Tiamat was torn asunder and transformed into the heaven and earth, her springs of water were placed under control, and the forces of anarchy and chaos were banished from the universe. Then followed the creation of the existing order of things. The sun and moon and stars were fixed in their places, and laws given to them which they should never transgress, plants and animals were created, and finally man.

Babylonian literature went back to a remote date. The age of Sargon of Akkad was already a highly literary one, and the library he founded at Akkad contained works which continued to be re-edited down to the latest days of Babylonian literature. Every great city had its library, which was open to every reader, and where the books were carefully catalogued and arranged on shelves. Here too were kept the public records, as well as title-deeds, law-cases, and other documents belonging to private individuals. The office of librarian was held in honour, and was not unfrequently occupied by one of the sons of the king. Every branch of literature and science known at the time was represented. Theology was naturally prominent, as well as works on omens and charms. The standard work on astronomy and astrology, in seventy-two books, had been compiled for the library of Sargon of Akkad; so too had the standard work on terrestrial omens. There was also a standard work on medicine, in which medical prescriptions and spells were mixed together. Philological treatises were numerous. There were dictionaries and grammars for explaining the Sumerian language to Semitic pupils, interlinear translations of Sumerian texts, phrase-books, lists of synonyms, and commentaries on difficult or obsolete words and passages, besides syllabaries, in which the cuneiform characters were catalogued and explained. Mathematics were diligently studied, and tables of squares and cubes have come to us from the library of Larsa. Geography was represented by descriptions of the countries and cities known to the Babylonians, natural history by lists of animals and birds, insects and plants. The Assyrians were endowed with a keen sense of history, and had invented a system of reckoning time by means of certain officers called limmi, who gave their names to their years of office. The historical and chronological works of the Assyrian libraries are therefore particularly important. They have enabled us to restore the chronology of the royal period of Israelitish history, and to supplement the Old Testament narrative with the contemporaneous records of the Assyrian kings. The Babylonians were less historically exact, perhaps because they had less of the Semitic element in their blood; but they, too, carefully kept the annals of their kings, and took a deep interest in the former history of their country.

Contract and other tablets relating to trade and business formed, however, the larger part of the contents of most Babylonian libraries. They have revealed to us the inner and social life of the people, so that the age of Khammurabi, or even of Sargon, in Babylonia, is beginning to be as well known to us as the age of Periklês in Greece. Along with the contract-tablets must be counted the numerous legal documents and records of law-cases which have been preserved. Babylonian law was, like English law, built upon precedents, and an elaborate and carefully considered code had been formed at an early date.