Prophetic Fulfillment
Besides serving as an alarm for danger, the shofar was used to call an assembly and to hail a king. “God goes up to shouts of acclaim, Adonai to a blast on the shofar,” says Psalm 47:5 (Complete Jewish Bible).
As Rosh Hashanah is the day when the shofar is sounded, it foreshadows the day when the Messiah will return and those in a renewed spiritual state will assemble before G-d. Scriptures in the Old and New Covenants speaks of this event:
“On that day Adonai will beat out the grain between the Euphrates River and the Vadi of Egypt; and you will be gathered, one by one, people of Isra'el! On that day a great shofar will sound. Those lost in the land of Ashur will come, also those scattered through the land of Egypt; and they will worship Adonai on the holy mountain in Yerushalayim. (Isaiah 27:12-13, CJB)"
“For the Lord himself will come down from heaven with a rousing cry, with a call from one of the ruling angels, and with God's shofar; those who died united with the Messiah will be the first to rise. (1 Thessalonians 4:16, CJB)”
Yeshua also spoke of this event with his disciples. “Then the sign of the Son of Man will appear in the sky, all the tribes of the Land will mourn, and they will see the Son of Man coming on the clouds of heaven with tremendous power and glory. He will send out his angels with a great shofar; and they will gather together his chosen people from the four winds, from one end of heaven to the other,” he said (Matthew 24:30-31, CJB).
More about Rosh Hashanah