Joshua 20:2

Speak to the children of Israel, saying
Whom the affair concerned the Lord spake to Joshua about, they having now the whole land divided among them:

appoint out for you cities of refuge;
of the name, nature, use, and number of these cities, (See Gill on Numbers 35:6);

whereof I spake unto you by the hand of Moses:
( Numbers 35:1-34 ) ( Deuteronomy 19:1-21 ) .