Parallel
Numbers 10:7
Rahlfs Septuagint (1935) · Berean Standard Bible
καὶ ὅταν συναγάγητε τὴν συναγωγήν σαλπιεῖτε καὶ οὐ σημασίᾳ
To convene the assembly, you are to sound long blasts, not short ones.