1 Corinthians 15:52

in a moment The literal meaning of the word here used is, that which is so small as to be actually indivisible.

in the twinkling of an eye Some MSS. read ῥοπῇ for ῥιπῇ, i.e. the downward motionof the eyelid (literally, the inclination of the scale), for the rapid movement suggested by the word twinkling. The latter suits the context best.

at the last trump Some have referred this to the last of the seven trumpets in Revelation 8-11. See especially Revelation 10:7. But this cannot be, since the visions recorded in that book had not yet been seen. It must therefore mean the trumpet which will sound on the last day. Cf. St Matthew 24:31 and 1 Thessalonians 4:16.

and we shall be changed The weis emphatic; therefore the Apostle here expresses once more his belief that he will be alive at the coming of Christ; for, "since the last times were already come, the saints expected that day from hour to hour." Calvin.