The ram's horn blown in Israel's assembly for war, worship, alarm, and feast. Hebrew shofar; Greek NT salpinx. Scripture sounds the trumpet at Sinai (Ex 19:16, where God Himself sounds it), at the conquest of Jericho (Josh 6), at the feast of trumpets (Lev 23:24, now called Rosh Hashanah), at the watchman's warning (Ezek 33:6), and at the eschatological gathering of the elect (Matt 24:31; 1 Cor 15:52; 1 Thess 4:16). Joel 2:1's blow the trumpet in Zion joins the day-of-the-LORD warning to the call for repentance. The shofar is not mere music; it is the audible sign that God Himself has spoken, summoned, or is about to act. The next great trumpet sound will raise the dead.