Genesis 36:7

For their riches were more than that they might dwell together,
&c.] And therefore it was proper to part, as Abraham and Lot had done before, ( Genesis 13:6 ) ; and the land wherein they were strangers could not bear them, because
of their cattle;
their cattle were so numerous that they could not get pasturage for them, there not being enough left them by the inhabitants of it for them to occupy; nor could they hire land of them sufficient for them both; they being not possessors but sojourners in it, and therefore could have no more of it than the inhabitants thought fit to let unto them.