Great Tribulation

Jeremiah 30:7 (KJV): Alas! for that day is great, so that none is like it: it is even the time of Jacob's trouble, but he shall be saved out of it.

Matthew 24:21 (KJV): For then shall be great tribulation, such as was not since the beginning of the world to this time, no, nor ever shall be.

Matthew 24:22 (KJV): And except those days should be shortened, there should no flesh be saved: but for the elect's sake those days shall be shortened.