1 Corinthians 15:52

in a moment, in the twinkling of an eye, at the sound of the last trumpet (for the trumpet shall sound) and the dead shall rise incorruptible; but as for us, we shall be changed.

1 Thessalonians 4:16

for the Lord himself will descend from heaven, and by the voice of the archangel, with the trumpet of God, resound the summons: they who died christians shall rise first:

Hebrews 12:20

nor could they endure that threat, "if so much as a beast touch the mountain, it shall be stoned."

Treasury of Scripture Knowledge

Summary

There shall not an hand touch it, but he shall surely be stoned, or shot through; whether it be beast or man, it shall not live: when the trumpet soundeth long, they shall come up to the mount.

Bible References

When the trumpet

1 Corinthians 15:52
in a moment, in the twinkling of an eye, at the sound of the last trumpet (for the trumpet shall sound) and the dead shall rise incorruptible; but as for us, we shall be changed.
1 Thessalonians 4:16
for the Lord himself will descend from heaven, and by the voice of the archangel, with the trumpet of God, resound the summons: they who died christians shall rise first: