With one trumpet. —Or, but once (or, at the same time). (Proverbs 28:18; Jeremiah 10:8.) …

And if they blow [but] with one [trumpet]
With only one of them, or but once, with one sounding, and that an even on…

Here, directions are given concerning the public notices to be given to the people by sound of trumpet. Their laws were in every case to be Divine;…