Halakhah do Liczb 35:28

The commandment on the court to send one who smites a soul inadvertently from his city to the cities of refuge and upon the killer himself to go there: That the courts of Israel were commanded to send one who smites a soul inadvertently from his city and restore him in the cities of refuge, as it is stated (Numbers 35:25), "and the community shall restore him to his city of refuge, etc. and there he shall remain until the death of the high priest." And also the smiter, he too, is included in this positive commandment, as it is stated about him (Numbers 35:28), "For he shall dwell in his city of refuge until the death of the high priest."