1-5. Jethro . . . came . . . unto Moses, &c.—It is thought by many eminent commentators that this episode is inserted out of its chronological order, for it is described as occurring when the Israelites were "encamped at the mount of God." And yet they did not reach it till the third month after their departure from Egypt (Ex 19:1, 2; compare De 1:6, 9-15).