Chukat 5773

Moshe is afraid of Og when Bnei Yisroel go to war with him. Rashi explains this is because Og had told Avraham about saving Lot, and Moshe had thought that this merit would protect Og. Hashem then guarantees a victory over Og. The Kli Yakar expounds on this and explains that Hashem was really saying to Moshe that Og never had any merit to begin with. Og had gone to Avraham with the wrong intentions; he wanted Avraham to die, so that he himself would marry Sarah.