Deuteronomy 19:12

then the elders of his own city shall send for him and have him taken back from there and turn him over to the avenger of blood, so that he may be put to death.

1 Kings 2:5-6

Now you also know what Joab the son of Zeruiah [my sister] did to me, and what he did to the two commanders of the armies of Israel, to Abner the son of Ner and to Amasa the son of Jether, [both of] whom he murdered; avenging the blood of war in [a time of] peace. And he put the [innocent] blood of war [of Abner and Amasa] on his belt that was around his waist, and on his sandals on his feet.

1 Kings 2:28-34

Now the news reached Joab, for Joab had supported and followed Adonijah, although he had not followed Absalom. So Joab fled to the [sacred] tent of the Lord and took hold of the horns of the altar [to seek asylum].

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