Israel could afford to purchase food and drink from the inhabitants of Mount Seir because the Lord had blessed his people in their work. Providing for his people for forty years in the wilderness was an act pure grace on the Lord's part, in light of their previous failures at Kadesh.
7 Car l'Eternel, ton Dieu, t'a béni dans tout le travail de tes mains, il a connu ta marche dans ce grand désert. Voilà quarante années que l'Eternel, ton Dieu, est avec toi: tu n'as manqué de rien.