What role did trumpets play for Israel and what other trumpets are mentioned in Revelation 4?

Les teaches that Israel was brought to convocations and congregational call by the trumpets. God also has His own trumpets, and there is the angelic trumpet. In this scene, John hears a trumpet from heaven, and as a trumpet it says, "Come up hither." Les pictures this symbolically as what will happen to the church: it too will hear a trumpet call, the archangel is going to give a shout, and suddenly those who know the Lord are going to be gone. He notes that the word Rapture is not in the English New Testament, though the German translation uses the word Rapture, a calling out. Earlier translations in 2 Thessalonians chapter 2 show that before the man of sin can be revealed, there has to be the departure of the body of Christ. After "come up hither," the next clear word is "hereafter"—after the church age has ended. John then says he was immediately in the Spirit; he did not go to glory bodily.