Genesis 13:6

And the land was not able to bear them, that they might
dwell together
That part of the country where Abram and Lot were could not afford them room enough for their several tents; or however could not furnish them with sufficient pasturage for their flocks and herds, they were so numerous; at least could not do it so as to be contiguous to each other, that there was a necessity of one of them going further off: for their substance was great, so that they could not dwell
together;
we have before an account of the substance of each of them, how great it was; and here now is noted an inconvenience which arises from a large increase of riches, that relations and friends are obliged to part, and cannot dwell together; what one would think would make them more comfortable together, is the cause and occasion of their separation.