TSK · Numbers 35:12

The revenger of blood himself shall slay the murderer: when he meeteth him, he shall slay him.

Lest the avenger of the blood pursue the slayer, while his heart is hot, and overtake him, because the way is long, and slay him; whereas he [was] not worthy of death, inasmuch as he hated him not in time past.

That the slayer that killeth [any] person unawares [and] unwittingly may flee thither: and they shall be your refuge from the avenger of blood.

And, behold, the whole family is risen against thine handmaid, and they said, Deliver him that smote his brother, that we may kill him, for the life of his brother whom he slew; and we will destroy the heir also: and so they shall quench my coal which is left, and shall not leave to my husband [neither] name nor remainder upon the earth.