28. the cities are great, and walled up to heaven--an Oriental metaphor, meaning very high. The Arab marauders roam about on horseback, and hence the walls of St. Catherine's monastery on Sinai are so lofty that travellers are drawn up by a pulley in a basket.
      Anakims--(See on Nu 13:33). The honest and uncompromising language of Moses, in reminding the Israelites of their perverse conduct and outrageous rebellion at the report of the treacherous and fainthearted scouts, affords a strong evidence of the truth of this history as well as of the divine authority of his mission. There was great reason for his dwelling on this dark passage in their history, as it was their unbelief that excluded them from the privilege of entering the promised land (Heb 3:19); and that unbelief was a marvellous exhibition of human perversity, considering the miracles which God had wrought in their favor, especially in the daily manifestations they had of His presence among them as their leader and protector.

JFB.