Commentaire sur Le Deutéronome 1:19

המדבר הגדול והנורא [THAT]. GREAT AND FEARFUL WILDERNESS — [It is termed fearful] because there were in it serpents thick as beams and scorpions as bows (Sifrei Devarim 18:2).

ונלך את כל המדבר הגדול והנורא, a way no one had crossed on foot before because of the many snakes and other predators and their size. These are referred to once more in 8,15. Our sages in Sifri 18 have described that the snakes were as large as beams and the scorpions as bows. If G’d had nonetheless chosen to lead them on this route, it had been to shorten the distance they would have to travel so that they could get to their destination before their tendency to quarrel, etc., would result in major sins. Nonetheless, G’d’s efforts in this respect had not proven to be sufficient; they had sinned on numerous occasions at locations Moses recalls by name.

ונלך את כל המדבר הגדול, “we went through this great desert.” This refers to the wanderings during the eleven days of which Moses spoke earlier. והנורא ההוא, “and that awesome one.” [This is a reference to the dangerous reptiles inhabited by this desert;] there were snakes as large as beams and scorpions the size of bows.