Judges 7:16-18

16Then he divided the 300 men into three columns, and he put into the hands of all of them shofarot and empty pitchers, with torches inside the pitchers.

17Then he said to them, “Watch me and do likewise. So behold, when I come to the outskirts of the camp, do just as I do.

18When I and all that are with me blow the shofar, then you also blow the shofarot all around the camp, and say, ‘For Adonai and for Gideon!’”