 Even though in and God forbade the Israelites from occupying the territory of Ammon and Moab, Rav Papa taught that the land of Ammon and Moab that Sihon conquered (as reported in ) became purified for acquisition by the Israelites through Sihon's occupation of it (as discussed in ).Explaining why Rabban Simeon ben Gamaliel said that there never were in Israel more joyous days than Tu B'Av (the fifteenth of Av) and Yom Kippur, Rabbah bar bar Hanah said in the name of Rabbi Johanan (or others say Rav Dimi bar Joseph said in the name of Rav Nahman) that Tu B'Av was the day on which the generation of the wilderness stopped dying out.For a Master deduced from the words, "So it came to pass, when all the men of war were consumed and dead .