C. F. Keil and Franz Delitzsch on Deuteronomy 1:32-33

Deu 1:32-33

“And even at this word ye remained unbelieving towards the Lord;” i.e., notwithstanding the fact that I reminded you of all the gracious help that he had experienced from your God, ye persisted in your unbelief. The participle אינכם מאמינם, “ye were not believing,” is intended to describe their unbelief as a permanent condition. This unbelief was all the more grievous a sin, because the Lord their God went before them all the way in the pillar of cloud and fire, to guide and to defend them. On the fact itself, comp. Num 9:15., Num 10:33, with Exo 13:21-22.