And if the avenger of blood pursue after him
 To the city of refuge, whither he is fled, and demand him: 
 then they shall not deliver the slayer up into his hands;
 to be slain by him, but shall protect him: 
 because he smote his neighbour unwittingly, and hated him not
 beforetime; (See Gill on Numbers 35:22), (See Gill on Numbers 35:23), and (See Gill on  Deuteronomy 19:6).