TSK · Numbers 35:19

And these cities shalbe vnto you a refuge from the auenger of blood: that he which killeth, dye not, vntill he stand before the congregation in iudgement.

Then the congregation shal iudge betweene the slayer and the reuenger of blood, according to these lawes.

Lest the auenger of the blood folowe after the slayer whyle his heart is hot, & ouertake hym because the wayes is long, and slay hym, and yet there is no cause worthy of death in hym, in as much as he hated hym not in tyme passed.

That the slear that kylleth any person vnwares and vnwyttyngly, may flee thyther: And those cities shall be your refuge from the auenger of blood.

And he sayd, They were my brethren, euen my mothers children: As truly as the Lord liueth, if ye had saued their lyues, I would not slay you.

(So Ioab & Abisai his brother slue Abner, because he had slayne their brother Asahel at Gibeon in battell.)