Joshua 21 describes the allocation of cities to the Levites from the various tribes of Israel. The verse "Holon with its suburbs, Debir with its suburbs" is part of a list detailing specific cities assigned to the Kohathite Levites from the tribe of Judah and Simeon.

Let's break down the meaning:

Holon and Debir: These are the names of two distinct cities. Holon (sometimes spelled Hilen) and Debir were located in the territory originally allotted to the tribe of Judah. Debir, in particular, had historical significance as it was conquered by Joshua.

With its suburbs: This is the key element needing explanation. "Suburbs" in this context doesn't mean exactly what we think of modern suburbs. It refers to the open land surrounding the city walls, extending outwards for a certain distance. This land served several purposes:

Pastureland: It was crucial for grazing livestock, which was vital for sustenance and offerings. Levites, unlike other tribes, didn't receive large land allotments for agriculture. They were supported by tithes and offerings from the people, and their livestock needed pasture.
Agricultural land: A portion of the "suburbs" would have been used for growing crops, although likely less than what the surrounding tribes would have.
Living space: While Levites resided in the cities, some of their families and servants likely lived within the "suburbs" area, outside the city walls.
Military purposes: The surrounding land provided a buffer zone and allowed for defense of the city.
General resources: The suburbs would also provide timber, fuel, and other resources.

In essence, the verse means that the Levites were given not only the city of Holon and the city of Debir, but also a surrounding amount of land that was considered attached to and essential for the function and livelihood of those cities. The exact boundaries of these "suburbs" were likely defined by established custom and usage.

Why is this important?

The allocation of cities and their suburbs to the Levites served several vital functions:

Provision: It ensured that the Levites, who were responsible for the religious duties of the nation, had a means of support.
Dispersion: It distributed the Levites throughout the land, allowing them to teach the Law and minister to the people in various locations.
Religious Influence: Having Levites present in different cities helped maintain religious integrity and provided guidance to the tribes.

Therefore, this verse isn't just a simple listing; it represents a specific and important provision made for the Levites, enabling them to fulfill their divinely appointed roles within Israel.