Deuteronomy 1:2

([There are] eleven days' [journey] from (c) Horeb by the way of mount Seir unto Kadeshbarnea.)

(c) In Horeb, or Sinai, forty years before the law was given: but because all that were then of age and judgment were now dead, Moses repeats the same to the youth who either then were not born, or had not judgment.