New Defender's Study Bible Notes
15:52 In a moment. “Moment” is the Greek atomos, believed at that time to be the very smallest particle of matter. The coming of Christ is to be very sudden, and without advance notice, so that we should be “abiding in Him” at all times. See I John 2:28; Hebrews 9:28; II Timothy 4:8.
15:52 the last trump. Paul is not referring to the last of the seven trumpets in the Apocalypse (Revelation 8:2; 11:15), for the book of Revelation had not yet been written and Paul obviously intended for the Corinthians to understand what he meant. The sounding of an angelic trumpet at the resurrection day had also been mentioned in I Thessalonians 4:16. Trumpets were traditionally associated with calls to action (e.g., I Corinthians 14:8; Judges 7:20), and this particular trumpet sounded in heaven will call all saints, living and dead, to ascend into heaven to meet the returning Christ. It is, therefore, “the last trump” of this present age of the church.