'Avenged' in the Bible

“If Cain is avenged sevenfold [as the Lord said he would be],Then Lamech [will be avenged] seventy-sevenfold.”

that this [incident] will not cause grief or [bring] a troubled conscience to my lord, both by having shed blood without cause and by my lord having avenged himself. When the Lord deals well with my lord, then remember [with favor] your maidservant.”

They brought the head of Ish-bosheth to David at Hebron, and said to the king, “Look, the head of Ish-bosheth the son of Saul, your enemy, who sought your life; thus the Lord has granted my lord the king vengeance this day on Saul and on his descendants.”

The Lord has returned upon you all the bloodshed of the house of Saul, in whose place you have reigned; and the Lord has given the kingdom into the hands of Absalom your son. And behold, you are caught in your own evil, for you are a man of bloodshed!”

Then Ahimaaz the son of Zadok, said, “Let me run and bring the king news that the Lord has vindicated him by rescuing him from [the power of] his enemies.”

And I shall avenge their blood which I have not avenged,For the Lord dwells in Zion.