Deuteronomy 4:41
Then Moses set apart three cities [of refuge] beyond the Jordan toward the rising of the sun (eastward),
Numbers 35:6
[Among] the cities which you give to the Levites shall be the six cities of refuge, which you shall provide for the one who commits manslaughter to flee to; and in addition to them you shall give forty-two cities [to the Levites].
Numbers 35:14-15
You shall provide three cities on this [east] side of the Jordan [River], and three [more] cities in the land of Canaan; they are to be the cities of refuge.
Joshua 20:2-9
“Speak to the Israelites, saying, ‘Designate the cities of refuge (asylum), of which I spoke to you through Moses,