The war with Sihon took place in the month of Elul. In the following month of Tishri they rested on account of the holy days, but immediately after these they set out to battle against Og. This king did not hasten to his brother's aid, although he was only one day's distance from him, for he felt sure Sihon could conquer Israel without his assistance. He erred in this, however, as in some other matters.
In the war of the four kings against the five, it was Og who had brought to Abraham news of his nephew Lot's bondage, assuming that Abraham would surely hasten to his kinsman's aid, be killed in battle, and thus enable Og to get possession of the beautiful Sarah. God, however, leaves no man unrewarded or unpunished. To reward him for hastening with quick steps to advise Abraham of Lot's captivity, God granted him life for five hundred years, but he was eventually killed because it was only a wicked motive that had induced him to perform this service for Abraham. He did not, as he had hoped, gain Sarah, but was slain by her descendant Moses.