Midrash su Isaia 35:8

4 Another interpretation: Why did all these stages (places) merit to be written in the Torah? Since they received (accommodated) Israel, the Holy One, blessed be He, will give them their reward in the future. It is so stated (in Isaiah 35:1-2), "The arid desert shall be glad.... It shall blossom abundantly, it shall also exult...." And if the desert [will receive] such for receiving Israel; one who receives a Torah scholar into his home, all the more so [will he be rewarded]. You find that in the future the desert will be a settlement and a settlement will be a desert. And where is it shown a settlement will be a desert in the future? It is so stated (Malachi 1:3), "And I have hated Esav and will make his hills a desolation." And where is it shown a desert will be a settlement in the future? It is so stated (Isaiah 41:8), "I will make a desert into a lake of water." Now there are no trees in the desert, but there will be trees there in the future, as stated (Isaiah 41:19), "I will put cedar and acacia in the desert...." Now there is no path there, as it is all sand. But there will be a path there in the future, as stated (Isaiah 43:19), "I will place a path in the desert […]." And it states (Isaiah 35:8), "And there will be a highway there, and it shall be called the Sacred Way [...]."