Numbers 10:9

9If you go forth to war from your land, against the enemies who set out against you, you shall sound the trumpets repeatedly, and there shall be a remembrance of you before the Lord your God, so that you may be rescued from the hands of your enemies.
10:9The word ‘ululantibus’ refers to a sound that is rolling, or undulating, or repetitive in some way. The combination of ‘clangetis ululantibus’ indicates that the trumpets are to be sounded repeatedly.(Conte)
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