Deuteronomy 2:7

For the Lord thy God hath blessed thee in all the works of
thine hands
Had increased their cattle and substance, even though in a wilderness:

he knoweth thy walking through this great wilderness;
every step they took, and he owned them and prospered them in all things in which they were concerned:

these forty years the Lord thy God hath been with thee:
not only to protect and defend them, but to provide all things necessary for them. This number of years was not fully completed, but the round number is given instead of the broken one:

thou hast lacked nothing:
and since they had wherewith to pay for their food and drink, they are directed to do it, and not take anything from the Edomites in an unjust way; nor make themselves look poor when they were rich, as Jarchi says.