Numbers 10:8-9

10:8 The sons of Aaron, the priests, must blow the trumpets; and they will be to you for an eternal ordinance throughout your generations. 10:9 If you go to war in your land against an adversary who opposes ¹  you, then you must sound an alarm with the trumpets, and you will be remembered before the Lord your God, and you will be saved ²  from your enemies.

¹ tn Both the “adversary” and “opposes” come from the same root: צָרַר (tsarar), “to hem in, oppress, harass,” or basically, “be an adversary.”

² tn The Niphal perfect in this passage has the passive nuance and not a reflexive idea – the Israelites would be spared because God remembered them.