Deuteronomy 19:12

then the elders of his city shall send and bring him there, and deliver him into the hand of the avenger of blood, that he may die.

1 Kings 2:5-6

"Moreover you know also what Joab the son of Zeruiah did to me, even what he did to the two captains of the armies of Israel, to Abner the son of Ner, and to Amasa the son of Jether, whom he killed, and shed the blood of war in peace, and put the blood of war on his sash that was about his waist, and in his shoes that were on his feet.

1 Kings 2:28-34

The news came to Joab; for Joab had turned after Adonijah, though he didn't turn after Absalom. Joab fled to the Tent of Yahweh, and caught hold on the horns of the altar.

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