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The books of the Hebrew Bible (Old Testament) cover a period of many centuries, reflecting a rich variety of conditions and beliefs, ranging from the culture of ancient nomadic shepherd tribes to the refinement of life and law of an urban population, from primitive clan henotheism to the ethical monotheism of the prophets. It is thus unwarranted to treat the ethics of the Bible as a unit; the ethical discussions contained therein do not all neatly flow from one dominant principle; there is no one set of clearly defined rules, conduct and obligation. Instead of one system of ethics, many systems have to be recognized and expounded. Nonetheless, the ultimate outcome of this evolution was ethical monotheism.
With these important qualifications kept in view, it is safe to hold that the principle underlying the ethical concepts of the Bible and from which the positive duties and virtues are derived is the unity and holiness of God, in whose image man was created. A life exponential of the divine in the human is the "summum bonum," the purpose of purposes, according to the ethical doctrine of the Biblical books. This life is a possibility and an obligation involved in the humanity of every man. For every man is created in the image of God (Gen. i. 26). By virtue of this, man is appointed ruler over all that is on earth (Gen. i. 28). But man is free to choose whether he will or will not live so as to fulfil these obligations.
From the stories in Genesis it is apparent that the Bible does not regard morality as contingent upon an antecedent and authoritative proclamation of the divine will and law. The "moral law" rests on the nature of man as God's likeness, and is expressive thereof. It is therefore autonomous, not heteronomous. From this concept of human life flows and follows necessarily its ethical quality as being under obligation to fulfil the divine intention which is in reality its own intention.
Enoch, Noah, Abraham, and other heroes of tradition, representing generations that lived before the Sinaitic revelation of the Law, are conceived of as leading a virtuous life; while, on the other hand, Cain's murder and Sodom's vices illustrate the thought that righteousness and its reverse are not wilful creations and distinctions of a divinely proclaimed will, but are inherent in human nature. The Israelites are under the obligation to be the people of God (, Ex. xix. 5 et seq.) that is to carry out in all the relations of human life the implications of man's godlikeness.
Hence, for Israel the aim and end, the "summum bonum," both in its individuals and as a whole, is "to be holy." Israel is a holy people (Ex. xix. 6; Deut. xiv. 2, 21; xxvi. 19; xxviii. 9), for "God is holy" (Lev. xix. 2, et al.). Thus the moral law corresponds to Israel's own historic intention, expressing what Israel knows to be its own innermost destiny and duty.
God is the Lawgiver because God is the only ruler of Israel and its Judge and Helper (Isa. xxxiii. 22). Israel true to itself can not be untrue to God's law. Therefore God's law is Israel's own highest life. The statutory character of Old Testament ethics is only the formal element, not its essential distinction. For this God, who requires that Israel "shall fear him and walk in all his ways and shall love and serve him with all its heart and all its soul" (Deut. x. 12, Hebr.), is Himself the highest manifestation of ethical qualities (Ex. xxxiv. 6, 7). To walk in God's ways, therefore, entails the obligation to be like God.
Ethics in systematic form, and apart from religious belief, is as little found in apocryphal or Judæo-Hellenistic literature as in the Bible. However, Greek philosophy greatly influenced Alexandrian writers such as the authors of IV Maccabees, the Book of Wisdom, and Philo.
Much progress in theoretical ethics came as Jews came into closer contact with the Hellenic world. Before that period the Wisdom literature shows a tendency to dwell solely on the moral obligations and problems of life as appealing to man as an individual, leaving out of consideration the ceremonial and other laws which concern only the Jewish nation. From this point of view Ben Sira's collection of sayings and monitions was written, translated into Greek, and circulated as a practical guide. The book contains popular ethics in proverbial form as the result of everyday life experience, without higher philosophical or religious principles and ideals.
More developed ethical works emanated from Hasidean circles in the Maccabean time, such as are contained in Tobit, especially in ch. iv.; here the first ethical will or testamentis found, giving a summary of moral teachings, with the Golden Rule, "Do that to no man which thou hatest!" as the leading maxim. There are even more elaborate ethical teachings in the Testaments of the Twelve Patriarchs, in which each of the twelve sons of Jacob, in his last words to his children and children's children, reviews his life and gives them moral lessons, either warning them against a certain vice he had been guilty of, so that they may avoid divine punishment, or recommending them to cultivate a certain virtue he had practised during life, so that they may win God's favor. The chief virtues recommended are: love for one's fellow man; industry, especially in agricultural pursuits; simplicity; sobriety; benevolence toward the poor; compassion even for the brute (Issachar, 5; Reuben, 1; Zebulun, 5-8; Dan, 5; Gad, 6; Benjamin, 3), and avoidance of all passion, pride, and hatred. Similar ethical farewell monitions are attributed to Enoch in the Ethiopic Enoch (xciv. et seq.) and the Slavonic Enoch (lviii. et seq.), and to the three patriarchs.
The Hellenistic propaganda literature made the propagation of Jewish ethics taken from the Bible its main object for the sake of winning the pagan world to pure monotheism. It was owing to this endeavor that certain ethical principles were laid down as guiding maxims for the Gentiles; first of all the three capital sins, idolatry, murder, and incest, were prohibited (see Sibyllines, iii. 38, 761; iv. 30 et seq.). In later Jewish rabbinic literature these "Noachide Laws" were gradually developed into six, seven, and ten, or thirty laws of ethics binding upon every human being.