“After these things I saw, and, look! an opened door in heaven, and the first voice that I heard was as of a trumpet, speaking with me, saying: ‘Come on up here, and I shall show you the things that must take place.’” (Revelation 4:1)

3. What does the voice “as of a trumpet” bring to mind, and who is undoubtedly the Source of it?

³ The Bible does not identify this “first voice.” Like Jesus’ strong voice heard earlier, it has a commanding trumpetlike sound. (Revelation 1:10, 11) It brings to mind the penetrating horn blast that signaled Jehovah’s presence at Mount Sinai. (Exodus 19:18-20) Undoubtedly, Jehovah is the majestic Source of the summons. (Revelation 1:1)