Numbers 35:14

Three on the other side of Jordan and three in the land of Canaan, to be safe places for flight.

Deuteronomy 4:41-43

Then Moses had three towns marked out on the far side of Jordan looking to the east;

Deuteronomy 19:8-10

And if the Lord your God makes wide the limits of your land, as he said in his oath to your fathers, and gives you all the land which he undertook to give to your fathers;

Joshua 20:7-9

So they made selection of Kedesh in Galilee in the hill-country of Naphtali, and Shechem in the hill-country of Ephraim, and Kiriath-arba (which is Hebron) in the hill-country of Judah.

Treasury of Scripture Knowledge

Summary

Ye shall give three cities on this side Jordan, and three cities shall ye give in the land of Canaan, which shall be cities of refuge.

General references

Bible References

Three cities

Deuteronomy 4:41
Then Moses had three towns marked out on the far side of Jordan looking to the east;
Deuteronomy 19:8
And if the Lord your God makes wide the limits of your land, as he said in his oath to your fathers, and gives you all the land which he undertook to give to your fathers;
Joshua 20:7
So they made selection of Kedesh in Galilee in the hill-country of Naphtali, and Shechem in the hill-country of Ephraim, and Kiriath-arba (which is Hebron) in the hill-country of Judah.

General references

Deuteronomy 4:41
Then Moses had three towns marked out on the far side of Jordan looking to the east;

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain