Numbers 35:26-28

But if the slayer come without the borders of the citie of his refuge, whither he was fled,

And the reuenger of blood finde him without the borders of the citie of his refuge, and the reueger of blood slay ye murtherer, he shalbe giltles,

Because he should haue remained in the citie of his refuge, vntill the death of the hie Priest: and after the death of the hie Priest, the slayer shall returne vnto the land of his possession.