Numbers 10

29 There is some confusion about the identity of Hobab. The word for "father-in-law" can refer to any male in-law in the family. One line of reasoning is that Hobab is another name for Jethro, and Reuel is his father. This interpretation seems inconsistent with Exo 2:18. The other line of reasoning is that Reuel was another name for Jethro (Exo 3:1), and Hobab is his previously unmentioned son (or possibly even a husband of one of his sister-in-laws). Jethro may have already left the Israelite camp (Exo 18:27) and left his son behind. Judg 4:11 makes it clearer that Hobab is Moses' brother-in-law.
30 Hobab was eager to return to his homeland.
31 Hobab knew the area well, even better than Moses did. Moses suggested that Hobab could be a guide and a scout for the Israelites. Although God was leading the way, it would take some planning to move so many people over the rough terrain.
32 Moses was obviously thinking about the benefits of the Promised Land. He promises Hobab that he, even a foreigner (a Kenite -- Judg 4:11), would share in God's promise if he would join them. It appears that Hobab was not persuaded since he is not mentioned again.
34 The pillar of cloud and fire led the way, and hovered over the camp as the Israelites traveled.
35 Moses developed a special prayer based on how he saw the pillar of cloud and fire move. In it, he asked that the enemies of God be so frightened that they would flee in all directions. Moses did not want any external difficulties that would hinder their progress towards the Promised Land.
36 When the pillar of cloud and fire stopped hovering and settled back on the tabernacle, it was as if God were returning to His people. This became a prayer of thanksgiving for Moses.