There is an interesting proverb: Animals do not die due to the curses of crows. The noises of birds or animals have limited meaning and cannot bring a curse on other animals or birds. A bird may fly over heads but will not alight on human heads. Similarly, a curse given by anyone for no apparent or worthy reason will not affect humans. (Proverbs 26:2)
Magic or charm: Some people believe that magicians, sorcerers, witches, or some people with special negative powers could bring a curse on someone. Sadly, even many Christians are afraid of such curses. No divination or curse or witchcraft or spell could affect a believer. (Numbers 23:23)
God’s authority: Only God is the source of all blessing and cursing. He blesses the righteous; and punishes and judges the wicked. This power and authority cannot be usurped by anyone, humans or demons.
No affected: In the Bible, there are occasions when people of God were cursed but were not affected. Shimei cursed King David when Absalom revolted and took over as king in Jerusalem. (II Samuel 16:5-13) Prophet Jeremiah states that all cursed him. (Jeremiah 15:10)
Reluctant Balaam: Balak, the king of Moab invited Balaam to curse Israel. He said: “How can I curse whom God has not cursed.” (Numbers 23:8) If God has not cursed anyone, no one could do so. In fact, cursing those God has blessed is very dangerous. Those who dig a pit for others to fall will fall in the same way, one who rolls a stone, it will back on him. (Proverbs 26:27)
Cursing as a garment: There were enemies of King David who loved to curse and wore cursing as his garment. David prayed for protection from such enemies. (Psalms 109:17-19)
Divine protection: People of God have divine protection. God spoke to Abraham stating He would bless those who bless Abraham, and curse those who dishonor or curse Abraham. (Genesis 12:3) If someone curses a believer without reason, indeed s/he invites the curse of God upon themselves.
Do I take refuge in God against all curses?