Judges 9:23-24

God sent an evil spirit That is, gave Satan permission to work upon their minds. That the cruelty done to the sons of Jerubbaal, &c. That is, the punishment of the cruelty. Men may do evil, and think they have profited themselves; may imagine they have strengthened themselves in their wickedness, and are quite secure; that they have procured themselves friends, who will stand by them, and save them: but God can, with the greatest ease, make all the devices of the wicked of none effect; can turn their best contrivances to their ruin, and punish them by those on whom they depended for help and security. The example of Abimelech and the men of Shechem, recorded in this chapter, may assure us, that God will not suffer the murderer to escape even in this world; but will punish him in some grievous manner or other.