Judges 9:56
Thus God rendered the wickedness of Abimelech, which he did unto his father, in slaying his seventy brethren:
Cross-references
Judges 9:24 foretold that the blood of the seventy brothers would come upon Abimelech—9:56 shows this fulfilled as God returned his evil.
Judges 9:45 records Abimelech's slaughter of Shechem—this is the evil that God repaid, directly referenced in 9:56 as the cause of his punishment.
Judges 9:20 is Jotham's curse against Abimelech and Shechem, which is fulfilled in v56.
Psalm 9:12 says God avenges blood and remembers the afflicted—this is precisely what happened when God punished Abimelech for murdering his brothers.
Galatians 6:7 states the sowing/reaping principle—God repays wickedness as seen in Abimelech's case.
2 Chronicles 21:4 recounts Jehoram slaying all his brothers, a direct parallel to Abimelech's murder of his seventy brothers to seize power.
Proverbs 5:22 describes the wicked being caught in their own sins—God's justice works through their own actions.
Matthew 7:2 teaches reciprocal judgment—a parallel principle of reaping what one sows.
Job 31:3 states that calamity is for the unrighteous—Abimelech's fate exemplifies this principle of divine retribution against evil.