A curse is a spoken word, (sometimes audibly or within private thoughts) to an individual, a family or a nation. This spoken word uttered in the power of the name of God or in the name of God's defeated enemy, Satan. A true curse has grave consequences it brings harm, a cause of ruin, destruction, judgment and can continue in several generations.
The power of spoken words in cursing and blessing can give direction to history. We are aware that our tongue has so much power to bring life or death. "The tongue has the power of life and death, and those who love it will eat its fruit." (Proverbs 18:21)
The Bible tells us "Do not let any unwholesome talk come out of your mouths, but only what is helpful for building others up according to their needs, that it may benefit those who listen." Ephesians 4:29
We must have great care of what comes out of our mouth. The effect of spoken words is not understood in its magnitude by most of Christian believers. With them we can help, building others up according to their needs.
The Scripture reveals God, Yahweh the living God as a God who delights to bless reaching as far as a thousand generations of those who love Him, but as a God who will curse up to the third generation when a just cause demands so.
" ...For I, the LORD your God, am a jealous God, punishing the children for the sin of the fathers to the third and fourth generation of those who hate me, but showing love to a thousand generations of those who love me and keep my commandments" (Deuteronomy 5:9,10).
"Like a fluttering sparrow or a darting swallow, an undeserved curse does not come to rest." (Proverbs 26:2) We see here a fundamental principle of cursing meaning that a curse witch has no cause is absolutely in vain. A curse with no cause upon a Christian, boomerangs back to the one who made it.
However, a deserved curse brings its consequences. For instance, a Jewish custom about adultery uncertainty was to bring the suspected woman to the priest and the priest cursed her. Yet, the curse took effect only if the woman was guilty. If she was innocent, the curse with no cause was ineffective and her husband could see that he was suspicios in vain.
"Then the priest shall put the woman under oath and say to her, "If no other man has slept with you and you have not gone astray and become impure while married to your husband, may this bitter water that brings a curse not harm you. But if you have gone astray while married to your husband and you have defiled yourself by sleeping with a man other than your husband"- here the priest is to put the woman under this curse of the oath-"may the LORD cause your people to curse and denounce you when he causes your thigh to waste away and your abdomen to swell. May this water that brings a curse enter your body so that your abdomen swells and your thigh wastes away."
" 'Then the woman is to say, "Amen. So be it." (Numbers 5:19, 22). What a curse!
In the Bible there are presented many reasons why God pronounced curse.
"The LORD had said to Abram: I will bless those who bless you, and whoever curses you I will curse; and all people on earth will be blessed through you". (Genesis 12:3). Anti-semitism is a cause of bringing God's curse. Abram was blessed by Yahweh, and God promised him that who ever blesses Abram will be blessed by God, and who ever curses Abram will be cursed by God.
Taking a look throughout history, the people and nations who were against Abram descendants whether Jews or Arabs, were unsuccessful, despite their apparent superiority in every area, God keeps His word!
This decisive act of judgment is made by God only where a reason demands it. Even the first divine curse had this principle." So the LORD God said to the serpent, "Because you have done this, "Cursed are you above all the livestock and all the wild animals! To Adam he said, "Because you listened to your wife and ate from the tree about which I commanded you, 'You must not eat of it,' "Cursed is the ground because of you"(Genesis 3:14,17);
The curse over the serpent was because he tempted Eve: "And I will put enmity between you and the woman, and between your offspring and hers; he will crush your head, and you will strike his heel." (Genesis 3:15)
The curse upon the serpent, points to the man's ultimate victory upon sin, the victory of Jesus Christ. We gain death through Adam by sin, and life through Jesus Christ. "For if, by the trespass of the one man, death reigned through that one man, how much more will those who receive God's abundant provision of grace and of the gift of righteousness rein in life through the one man, Jesus Christ" (Romans 5:17)
The Apostle Paul uses comparison between our unification in Christ as Savior and our solidarity in Adam as sinners. All mankind is affected since, and it will pass away only when the great and glorious day of Revelation 22:3 dawns: "and there shall be no more curse".