Joshua 20:9

These were the cities appointed for all the children of Israel, and for the stranger that sojourneth among them, that whosoever killeth any person at unawares might flee thither, and not die by the hand of the avenger of blood, until he stood before the congregation.

Cross-reference

Joshua 20:4 describes the procedure for seeking refuge; verse 9 gives the inclusive purpose for all, including foreigners.

Joshua 20:6 specifies the duration of refuge until the high priest's death; verse 9 emphasizes protection from the avenger until trial.

Numbers 35:15 establishes the same rule: cities of refuge are for both Israelites and foreigners who kill unintentionally, which Joshua 20:9 reiterates.

Numbers 35:12 states the same purpose: cities protect the unintentional killer from the avenger until judgment, echoed here.