There was a devastating event in Genesis chapter 34. Dinah, the only daughter of Jacob and Leah was raped by Shechem.
Shechem loved Dinah but his actions were impulsive and evil. Not only did he sin against Dinah, he sinned against the whole family. The consequences of his deed were severe both for his family and all the males in their country and for Jacob's.
Simeon and Levi, the brothers of Dinah did not brush this thing off. They were outraged and seek revenge. They murdered Shechem, Hamor, Shechem's father and all the males in the city. They took their livestocks, wealth and their wives.
Simeon and Levi's desire for justice was right, but their ways of achieving it were wrong. Because of their sin, their father cursed them before he died.
The lessons for the devastating event is to leave revenge to God. "Vengeance is mine, says the Lord."
God sees everything and knows your desire for justice. Cast it all to Him rather than taking things on your own which leads to dreadful consequences of sin.
