Exodus 19:13

19:13 No hand will touch him – but he will surely be stoned or shot through, whether a beast or a human being; he must not live.’ When the ram’s horn sounds a long blast they may go up on the mountain.”

Joshua 6:5

6:5 When you hear the signal from the ram’s horn, have the whole army give a loud battle cry. Then the city wall will collapse and the warriors should charge straight ahead.”