Charles Spurgeon Commentary 1 Corinthians 15:52

"in a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed." — 1 Corinthians 15:52 (ASV)

In a moment, in the twinkling of an eye, at the last trump for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.

Somehow or other, such a change as this must take place before we can enter heaven, for flesh and blood cannot inherit the kingdom of God.