Numbers 35:26-28

Bishops(i) 26 But if the slayer come without the borders of his citie of refuge, whyther he was fled 27 And the reuenger of blood finde hym without the borders of the citie of his refuge, and the reuenger of blood kyll the slayer, he shalbe gyltlesse 28 Because he shoulde haue bydden in the towne of his refuge vntill the death of the hye priest; and after the death of the hye priest, the slayer should returne vnto the lande of his possession