Judges 9:57

so that the violence done to the seventy sons of Jerubbaal might come, and their blood might be laid on Abimelech their brother, who killed them, and on the lords of Shechem, who strengthened his hands to kill his brothers.

“And Yahweh will return his blood on his own head, because he fell upon two men more righteous and better than he and killed them with the sword, but my father David did not know it: Abner the son of Ner, commander of the army of Israel, and Amasa the son of Jether, commander of the army of Judah.