The Lord tells Moses to make two trumpets of hammered silver, to call the congregation together and to signal the departure of the camps. When both sound, the whole congregation will gather at the entrance of the tent; when one sounds, only the leaders will gather. A blast of alarm will signal the camps to set out, first those on the east and then those on the south. The sons of Aaron, the priests, will blow the trumpets, which will also be used in war, on feast days and over the offerings, as a reminder before God.
On the twentieth day of the second month of the second year, the cloud lifts from the tabernacle, and the Israelites set out from the wilderness of Sinai toward the wilderness of Paran. They march in the established order: first Judah, with Issachar and Zebulun; then the Gershonites and Merarites with the dismantled tabernacle; then Reuben, Simeon and Gad; then the Kohathites with the holy things; then Ephraim, Manasseh and Benjamin; and last Dan, Asher and Naphtali.
Moses invites Hobab, son of Reuel the Midianite, to come with them and promises him good. Hobab first answers that he prefers to return to his own land, but Moses insists: Hobab knows the wilderness and will be eyes for them. The ark of the covenant goes ahead for three days' journey, seeking a resting place, and the cloud covers them by day. When the ark sets out and when it rests, Moses speaks a brief prayer: that the Lord rise and scatter his enemies, and that he return to the many thousands of Israel.