Numbers 10:6 (BSB)

When you sound the short blasts a second time, the camps that lie on the south side are to set out. The blasts are to signal them to set out.

From Numbers 10. Also in the ESV.

Commentary on Numbers 10:6

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 10:1-10: We have here directions concerning the public notices that were to be given to the people upon several occasions by sound of trumpet. In a thing of this nature, one would think, Moses needed not to have been taught of God: his own reason might teach him the conveniency of trumpets; but the constitution of Israel was to be in every thing divine, and therefore...
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 10:6: When ye blow an alarm the second time,.... Another "tara-tan-tara": then the camps that lie on the south side shall take their journey; the camps of Reuben, Simeon, and Gad, which were encamped on the south side of the tabernacle, Num 2:10; and, as Josephus (k) says, at the third sounding of the alarm, that part of the camp which lay to the west moved...
• Geneva Bible Notes (Reformed), Geneva Bible Study Notes on Numbers 10:6: When ye blow an alarm the second time, then the camps that lie on the south side shall take their journey: they shall blow an alarm for their journeys. (c) Meaning, the heart of Reuben.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 10:5-6: Num 10:5-6 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.