The classical source expands or derives a specific point from the language of the passuk. The Core Text above is the relevant region of interest.
Type of Learning
Custom (An aggadic comparison that uses the language of the verse to characterize a transient, unsettled way of life.)
What Is Learned
People who live in temporary booths (or tents), constantly moving with their flocks, lack the stability of settled community life. Chazal therefore liken them to dwellers of graves — exposed to the elements and cut off from the settled patterns of Torah and civic life.