Matthew Poole and continuators on Deuteronomy 19:2

2 Thou shalt separate three cities for thee in the midst of thy land , which the LORD thy God giveth thee to possess it.

To wit, beyond Iordan, as there were three already appointed on this side Iordan, Numb. 35. 14. He saith, in the midst of the land, either for, in the land, as in the midst of the city, Ier. 52. 25. is the same with that, in the city; 2 King. 25. 19. or to design the places, that they should be scituated in the midst of the several parts of their land, to which they might conveniently and speedily flee from all the parts of the land.

Marginal references: Exod. 21. 13. Num. 35. 10. 11. Josh. 20. 2.