Numbers 35:11 (BSB)

designate cities to serve as your cities of refuge, so that a person who kills someone unintentionally may flee there.

From Numbers 35. Also in the ESV.

Commentary on Numbers 35:11

• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 35:11: Then ye shall appoint your cities to be cities of refuge for you,.... And, according to the Jewish writers (i), these were neither to be made large nor little, but middling; and they appointed them where there were markets and fairs, at which goods were to be sold; and where there was plenty of water, and a multitude of people; and where there were but...
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Numbers 35:11: THE BLOOD AVENGER. (Num. 35:9-34) that the slayer may flee thither, which killeth any person at unawares--The practice of Goelism, that is, of the nearest relation of an individual who was killed being bound to demand satisfaction from the author of his death, existed from a very remote antiquity (Gen 4:14; Gen 27:45).
• Adam Clarke (Methodist), Clarke's Commentary on the Bible on Numbers 35:11: Ye shall appoint - cities of refuge - The cities of refuge among the Israelites were widely different from the asyla among the Greeks and Romans, as also from the privileged altars among the Roman Catholics. Those among the Hebrews were for the protection of such only as had slain a person involuntarily. The temples and altars among the latter often served for the protection of the most profligate characters.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 35:9-11: Num 35:9-11 Selection and Appointment of Cities of Refuge for Unpremeditated Manslayers. - Num 35:10, Num 35:11. When the Israelites had come into the land of Canaan, they were to choose towns conveniently situated as cities of refuge, to which the manslayer, who had slain a person (nephesh) by accident (בּשׁגגה: see at Lev 4:2), might flee.