Jews who travel on camels in caravans with Sons of Ishmael in the great and terrible desert do not, as everyone knows, ride on horseback and must publicly desecrate the Sabbath to remain with the caravan because of the dangers of tarrying alone in the desert over the Sabbath. The question arises whether it is right to object that they travel by caravan in the desert, so that they are not led to desecrating the Sabbath, despite the fact that they have no way of surviving other than traveling with a caravan… It is permitted to leave the settlement in a caravan on Sundays, Mondays or Tuesdays, for these three weekdays relate to the previous Sabbath and are considered as after the Sabbath. One need not refrain from leaving because of the upcoming Sabbath and if because of impending life-threatening danger one must desecrate the Sabbath, it is permissible and involves no prohibition. But it is forbidden to leave the settlement on Wednesdays, Thursdays and on the Sabbath eve, for these three days relate to the upcoming Sabbath and are considered as preceding the Sabbath.