Deuteronomy 1:2-4

2Normally it takes only eleven days to travel from Mount Sinai to Kadesh-barnea, going by way of Mount Seir.

3But forty years after the Israelites left Egypt, on the first day of the eleventh month, Moses addressed the people of Israel, telling them everything the Lord had commanded him to say.

4This took place after he had defeated King Sihon of the Amorites, who ruled in Heshbon, and at Edrei had defeated King Og of Bashan, who ruled in Ashtaroth.