A curse is the effective action of supernatural power, distinguished solely by the quality of adversity that it brings, else it would be considered a "charm" or a "blessing." A curse may also be said to result from a spell or prayer, imprecation or execration, or other imposition by magic or witchcraft, asking that a god, natural force, or spirit bring misfortune to someone.
The forms of curses found in various cultures comprise a significant proportion of the study of both folk religion and folklore.
In a broader sense, 'curse' is a loose synonym for blasphemy or profanity (i.e. a "curse word.")
"The curse" is also a term for the original sin of Adam and Eve in the Christian religion, and a slang term for menstruation.
Most established religions forbid such practices outright, but others, citing the long history of scriptural curses, utilize them only in defense against evil that struck at them first. All religions offer forms of blessings of homes and objects and people, with the intent of removing curses. Typically then a curse is only a category or type of something much larger, namely the entirety of any given culture's religio-magical paradigm.
Moreover, when negative or painful spiritual possession and demonic possession are viewed as varieties of curse, the religious authorities may see to it that there is a sanctioned way for the curse to be removed. According to Catholic records, for example, the original staff of the Vatican included 300 full time exorcists - specialists in the removal of demons inhabiting humans.
Some people believe curses to be strictly psychological in effect and/or superstitious in nature; these people generally hold rationalist opposing viewpoints to the opinion that curses are actual and real.
Special names for specific types of curses can be found in various cultures:
According to the Book of Proverbs, an undeserved curse has no effect (Proverbs 26:2), but may fall back upon the head of him who utters it (Genesis] 12:3; Sirach 21:27), or may be turned by God into a blessing (Deuteronomy 23:5).
The declaration of punishments (Gen. 3:14, 17; 4:11), the utterance of threats (Jeremiah 11:3, 17:5; Malachi i. 14), and the proclamation of laws (Deut. 11:26-28, 27:15 et seq.) received added solemnity and force when conditioned by a curse.
In the Bible, cursing is generally characteristic of the godless (Ps. 10:7), but may serve as a weapon in the mouth of the wronged, the oppressed, and those who are zealous for God and righteousness (Judges 9:57; Prov. 11"26, 30:10).
A righteous curse, especially when uttered by persons in authority, was believed to be unfailing in its effect (Gen. 9:25, 27:12; II Kings 2:24; Ecclus. Sirach 3:11). One who had received exemplary punishment at the hands of God was frequently held up, in cursing, as a terrifying object-lesson (Jer. 23: 22), and such a person was said to be, or to have become, a curse (II Kings 22:19; Jer. 24:9, 25: 18; Zechariah 8:13). An elaborate trial by ordeal for a woman suspected by her husband of adultery is set forth in Numbers 5:11-30; this involved drinking a "bitter water that brings a curse"; if the woman were guilty, she would suffer miscarriage and infertility.
It is especially forbidden to curse God (Exodus 22:28), parents (Ex. 21:17; Leviticus 20:9; Prov. 20:20, 30: 11), the authorities (Ex. 22:28; Eccl. 10:20), and the helpless deaf (Lev. 19:14).
Not only is a curse uttered by a scholar unfailing in its effect, even if undeserved (Mak. 11a), but one should not regard lightly even the curse uttered by an ignorant man (Meg. 15a).
The Biblical prohibitions of cursing are legally elaborated, and extended to self-cursing (Shebu. 35a). A woman that curses her husband's parents in his presence is divorced and loses her dowry (Ket. 72a).
Cursing may be permissible when prompted by religious motives. For instance, a curse is uttered against those who mislead the people by calculating, on the basis of Biblical passages, when the Messiah will come (Sanhedrin 97b). Cursed are those who are guilty of actions which, though not forbidden, are considered reprehensible.
According to legend, some rabbinic scholars cursed sometimes not only with their mouths, but also with an angry, fixed look. The consequence of such a look was either immediate death or poverty (Sotah 46b, and parallel passages). (See Evil eye)
In the text of katadesmoi and defixiones, the petitioner uttered a prayer or formula that the enemy would suffer injury in some specific way, along with the reason therefore, such as theft or loss of respect.
The Romans, Etruscans, and Greeks in Italy all practiced this custom. Fortunately for us, they buried the curses so well that today we have a body of curse inscriptions to tell us how they practiced their harmful magical works.
The Qur'an, verse Surah 33, verse 68:
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