1 Corinthians 15:52

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

1 Thessalonians 4:16

For the Lord himself will descend from heaven with a loud summons, with the voice of an archangel, and with the trump of God, and the dead in Christ will rise first;

Hebrews 12:20

for they could not bear that which was commanded, "If even a beast touch the mountain, it shall be stoned;" and,

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 last trump. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed.
1 Thessalonians 4:16
For the Lord himself will descend from heaven with a loud summons, with the voice of an archangel, and with the trump of God, and the dead in Christ will rise first;