Numbers 10:5

To give the signal for breaking up the camp, they were to blow תּרוּעה, i.e., a noise or alarm. At the first blast the tribes on the east, i.e., those who were encamped in the front of the tabernacle, were to break up; at the second, those who were encamped on the south; and so on in the order prescribed in ch. 2, though this is not expressly mentioned here. The alarm was to be blown למסּעיהם, with regard to their breaking up or marching.

In this chapter we have, I. Orders given about the making and using of silver trumpets, which seems to have been the last of all the commandments God gave upon mount Sinai, and one of the least, yet not without its significancy (Num 10:1-10). II. The history of the removal of Israel's camp from mount Sinai, and their orderly march into the wilderness of Paran (v. 11-28). III. Moses's treaty with Hobab, his brother-in-law (Num 10:29-32). IV. Moses's prayer at the removing and resting of the ark (Num 10:33, etc.).

10:5-8 When it was time to break camp, the sound of the trumpets supplemented the movement of the pillar of cloud (cp. 9:15-22) by signaling when to camp and when to move on (see ch 2).